Anyone new to Parker Huntington's stuff is probably coming for those mega-popular TikTok dark romances, right? So you're almost forced to start with 'The Dark One', the first book in her Dark Verse series. It's essentially her signature work—that whole mafia, forced proximity, morally grey hero vibe she's famous for. The series is interconnected, so starting there gives you the foundation. Honestly, 'The Dark One' isn't even my personal favorite in the series (I'm a 'The Darkest Corner' girl), but it's the clear gateway. The character arcs build across the books, and you'll miss a lot of the tension and backstory if you jump in later.
After that core series, 'A Million Kisses in Your Lifetime' is the other massive standalone hit. It's a lot lighter, a college rivals-to-lovers thing, and it shows her range. It's a good palate cleanser if the dark mafia intensity gets a bit heavy. But yeah, the reading order isn't super complicated; just dive into Dark Verse from the beginning. The later books get more complex and the world expands, but you need that first hit of Ransom and Morana.