Which Book Series Became A Split Trilogy Adaptation?

I still get a little giddy when people bring this up, because one of my favorite oddities in film adaptations is when a single novel gets stretched into multiple movies. The clearest, most talked-about case is definitely 'The Hobbit' — a single, relatively short J.R.R. Tolkien novel was turned into a three-film trilogy: 'An Unexpected Journey', 'The Desolation of Smaug', and 'The Battle of the Five Armies'. I watched those back-to-back in a tiny theater once on a whim and the stretch from book to epic cinematic trilogy was wild to witness: new subplots, added characters, and a lot of material pulled from appendices and Tolkien’s broader legendarium to bulk it out. If you look a bit broader, there are similar situations where one novel became the seed for a film trilogy even if the later installments weren’t direct adaptations. Mario Puzo’s 'The Godfather' is a neat example — the original novel inspired Francis Ford Coppola’s three-part film saga, even though parts II and III expand beyond the single book’s pages. Peter Benchley’s 'Jaws' is another case where one story launched a film series (eventually a trilogy) as Hollywood kept going back to the box office well. Studios pull this trick for lots of reasons: brand recognition, the chance to milk an existing story for more box office, or simply because they see more story in the margins. Sometimes it works brilliantly, sometimes fans grumble, but to me it’s always fascinating to see how a book’s world is reimagined when it’s stretched into multiple films — and it makes for a great topic when arguing with friends over drinks about which adaptation improved on the source and which one watered it down.

If you mean the trio of films that people often call the 'Split' trilogy, then the director is M. Night Shyamalan. He’s the one who tied together 'Unbreakable' (2000), 'Split' (2016), and 'Glass' (2019) into that unusual, low-key superhero-ish saga. I love how he threaded a quiet, eerie atmosphere through all three—Bruce Willis and Samuel L. Jackson anchor the first and last films, while James McAvoy absolutely steals the show in 'Split' with that unbelievable performance. I actually saw 'Split' in a near-empty theater and remember the hair-standing moments; when fans later realized it was part of the same universe as 'Unbreakable,' it felt like a secret handshake. Shyamalan is famous for those structural twists and slow-burn storytelling, and with these movies he explored superhero ideas in a grounded, psychological way. The trilogy’s sometimes clumsy, sometimes brilliant mix of character study and genre play makes it endlessly rewatchable for me, especially once you know to look for the connective threads. If you’re curious, watch them in release order to feel the payoffs properly: 'Unbreakable', then 'Split', then 'Glass'. I keep coming back to small details—Eastrail 177, the comic-of-sorts that David Dunn carries, the ways McAvoy’s character is staged—and it’s one of those film series that rewards patience and attention.

I still get a little thrill thinking about how many novels I fell in love with again because a TV show did them justice. For me the most obvious big one is 'Game of Thrones' — George R.R. Martin’s epic put medieval political drama back on the map for a whole new generation, and the casting, production scale, and shock factor turned it into a cultural event. Close behind are shows like 'The Handmaid's Tale' (Margaret Atwood), which hit differently in the streaming era because its themes matched real-world anxieties and the lead performance was furious and unforgettable. Going further back into my bookshelf-brain, 'Sherlock' (based on Arthur Conan Doyle) reimagined a classic with modern tech and a chemistry between leads that felt fresh, while 'Big Little Lies' (Liane Moriarty) proved limited-series adaptations could be prestige television — layers of performances, soundtrack, and gorgeous cinematography carried it. Even markedly different works like 'Good Omens' (Neil Gaiman and Terry Pratchett) succeeded by leaning into the authors' voice and charmingly offbeat tone. What ties these together, in my view, is respect for source material paired with confident showrunners who know when to expand, condense, or pivot. If a series keeps the spirit and sharpens the story for TV, it can become a hit — and those are the ones I can’t stop recommending to friends.

The Godfather. Mario Puzo's novel was a smash hit, and the film adaptation is regularly cited as one of the greatest movies ever made. It's the rare case where the film arguably surpassed the source material in depth and artistry. Coppola took a pulpy, popular mafia story and turned it into a cinematic masterpiece about family and power. Most people don't even realize it was a best-selling book first because the movies cast such a long shadow.

The 'All Souls Trilogy' by Deborah Harkness is a fascinating blend of history, romance, and the supernatural, and its TV adaptation, 'A Discovery of Witches,' brings this world to life in a visually stunning way. However, there are notable differences between the books and the series that fans often discuss. One of the most significant changes is the pacing. The books take their time to delve into the intricate details of the world-building, the historical context, and the relationships between characters. The TV series, on the other hand, condenses some of these elements to fit the episodic format, which can make certain plot points feel rushed or less developed. For instance, the slow-burn romance between Diana and Matthew in the books is given more room to breathe, allowing readers to fully invest in their connection. In the series, their relationship progresses more quickly, which, while still compelling, lacks some of the depth and nuance of the source material. Another key difference lies in the portrayal of certain characters. In the books, Diana’s journey of self-discovery and her growing powers are central to the narrative, and her internal struggles are explored in great detail. The series does a commendable job of capturing her strength and determination, but some of her internal monologues and the subtleties of her character development are inevitably lost in translation. Similarly, Matthew’s complex personality, shaped by centuries of history and his vampire nature, is more thoroughly examined in the books. The series portrays him as brooding and intense, but some of the layers that make him such a compelling character in the novels are less prominent on screen. The visual medium of the TV series allows for a more immediate and immersive experience of the story’s magical elements. The spells, the alchemy, and the various supernatural creatures are brought to life with impressive special effects, which adds a new dimension to the story. However, this also means that some of the imaginative work left to the reader in the books is replaced by the show’s interpretation. For example, the descriptions of Diana’s magical abilities and the intricate details of her spellcasting are more vivid and open to interpretation in the books, while the series presents them in a more concrete way. Lastly, the TV adaptation makes some changes to the plot and certain events to streamline the story for television. While these changes are often necessary for the medium, they can sometimes alter the tone or impact of key moments. For instance, some subplots and secondary characters are either condensed or omitted entirely, which can affect the overall richness of the narrative. Despite these differences, both the books and the TV series have their own unique strengths, and fans of the 'All Souls Trilogy' can appreciate each for what it brings to the table. The books offer a deeper, more immersive experience, while the series provides a visually captivating and accessible way to enjoy the story.

Stephen King's 'The Dark Tower' is a tragic example. Those books are a monumental, genre-blending bestseller, but the one movie they made was a confused, truncated mess that tried to cram too much into one film. It's a shame, because the weird western fantasy vibe could be amazing as a prestige series. Fans are still waiting for a proper adaptation that captures the epic, surreal scale of Roland's quest.

Romance trilogies have this magical way of pulling readers into a world where love feels epic and all-consuming. One that immediately comes to mind is the 'Fifty Shades' trilogy by E.L. James—love it or hate it, you can’t deny its impact. It started as fanfiction and exploded into a cultural phenomenon, dominating bestseller lists for years. The slow burn between Anastasia and Christian, with all its controversy, had people talking nonstop. Then there’s the 'After' series by Anna Todd, another fanfiction-turned-sensation. Tessa and Hardin’s toxic yet addictive relationship had readers hooked, proving that messy love stories can be just as compelling as the fairy-tale ones. Another standout is the 'All Souls' trilogy by Deborah Harkness, blending romance with fantasy in a way that feels fresh. Diana and Matthew’s forbidden love across centuries is packed with history, magic, and enough tension to keep you flipping pages. It’s a more refined take compared to the steamier trilogies, but it found its audience and stayed on bestseller lists for ages. And let’s not forget Colleen Hoover’s 'Maybe Someday' series—though not a traditional trilogy, her interconnected love stories have a loyal following. Her ability to mix heartbreak and hope makes her books impossible to put down. Romance readers really can’t resist a well-written trilogy that lets them live in a love story longer than just one book.

One of the most adapted book series has to be 'Sherlock Holmes' by Arthur Conan Doyle. It feels like every few years, there’s a new take on the iconic detective—whether it’s Benedict Cumberbatch’s modernized version in 'Sherlock' or Robert Downey Jr.’s action-packed films. Even anime like 'Moriarty the Patriot' twists the original into something fresh. The sheer number of TV shows, movies, and even video games proves how timeless Holmes is. People just can’t resist revisiting Baker Street and its mysteries. What’s fascinating is how each adaptation reflects its era. The BBC’s 'Sherlock' nailed the tech-savvy, fast-paced vibe of the 2010s, while older films leaned into the Victorian charm. And let’s not forget the countless radio dramas and stage plays! It’s wild how one character can inspire so much creativity across centuries. I’d argue no other series has been reimagined this often—or this diversely.

My ideal way to watch a split trilogy depends on whether you want the story straight or the theatrical experience. If you want the clearest narrative, I always start with the films in story-chronological order — that means watching Part A of the middle installment right after Part B of the first, etc., so the emotional through-line stays intact. For example, when friends and I did a mini-marathon of 'The Hobbit' movies one rainy weekend (tons of tea and terrible movie snacks), we treated the split scenes as continuous chapters and it felt like a long, breathy novel rather than three separate events. If you care about how audiences experienced the ride when the movies came out, go release order. That preserves the reveals, the marketing rhythms, and sometimes the jumpy pacing that directors lean into. Also, watch any extended or director’s-cut versions after you’ve seen the theatrical releases — they flesh things out but can spoil surprises if you dive in too early. When a trilogy’s finale is split into two films, I usually schedule a short break between parts: stretch, refill snacks, and read a concise recap if needed. That little gap sharpens the second half. Finally, keep the extras optional but fun. Behind-the-scenes and commentary tracks are great for a second viewing or for nerdy post-movie chats with friends. I often rewatch favorite sequences the next day to savor them — it’s oddly comforting. Try different orders once; each gives you its own flavor.