How Do Character Arcs Progress Across It Ends With Us And Its Sequel?

I keep thinking about the little moments that echo. Like, Lily gives Atlas a tattoo in the first book, a permanent mark of her care when he had nothing. In the second, their love is that permanent mark on each other's lives, but in a healthy, mutual way. Or how Ryle first charms Lily by being impulsively passionate, and that same impulsivity later becomes violent. The arcs are connected by these traits that are strengths in one context and fatal flaws in another. The books dissect how the same characteristic—passion, protectiveness, independence—can be life-giving or destructive depending on the person's emotional health.

The ultimate timeline summary: Past (Atlas 1.0) -> Recent Past (Meeting/Marrying Ryle, encountering Atlas 2.0) -> Pivotal Present (Leaving Ryle, having baby, Atlas returns) -> Immediate Future (Dating Atlas, co-parenting). Book 1 covers the first three phases. Book 2 is the last phase. It's really that clean.

I have mixed feelings. The first book's timeline, with its heavy reliance on diary entries, felt gimmicky to some of my friends, but I thought it was effective. It made the past visceral. The sequel's timeline, while more straightforward, risked being mundane. But Hoover smartly wove in Atlas's past, which kept the narrative from becoming just a domestic slice-of-life. The two timelines (past Atlas, present couple) kept tension alive.

For me, the link is all about closure on different levels. 'It Ends With Us' provides closure on the abusive relationship with Ryle. 'It Starts With Us' provides closure on the 'what if' with Atlas. The timeline literally connects at the moment of Lily's decision to finalize the divorce, but emotionally, they connect across decades—from Lily's childhood trauma with her father to her mother's letters to her first love with Atlas to her traumatic marriage and finally to a peaceful future. The sequel allows the timeline to stretch forward into a hopeful future, whereas the first book was primarily about reconciling with the past. So they're bookends: one about ending a cycle, the other about starting a legacy.

It's two distinct phases. Phase 1 (Book 1): Trauma, realization, and the courageous end of a cycle. Phase 2 (Book 2): Recovery, rebuilding, and a careful new beginning. There's a quiet space between the books—the hardest part, where she's a single mom—that we don't see. The sequel wisely skips the rawest grief to focus on the hopeful, complex reality of moving forward while co-parenting with an abuser.

So many little threads in those books make the fox feel alive across the series, and I get way too emotionally invested in how animals change around Roz. In the first book, the island animals (including the fox) treat Roz like a weird machine — wary, curious, sometimes hostile. That initial distance sets up the fox's baseline: cautious, survival-first, tuned to the rhythms of the wild. Over the course of the sequels, that baseline nudges forward into real growth. The fox stops being just a symbol of suspicion and becomes a participant in the community's shifting definition of family, responsibility, and trust. Watching a wild creature learn to tolerate, then rely on, then defend a non-human caretaker is quietly powerful, and the fox’s responses act as a mirror to Roz’s own learning about empathy and adaptation. What I find most satisfying is how the arc is handled through relationship changes rather than flashy plot twists. The fox’s evolution is incremental — small acts of sharing, a moment of protection, a decline of hostility — and those moments stack. In the second book, the dynamics have been rearranged: threats and new environments force alliances, and the fox is pushed to make different choices. That pressure reveals new layers — stubbornness softens into cooperation, and instinctive self-preservation becomes balanced by a sense of belonging. It’s a gentle but clear development: the fox shifts from an isolated survival mode to a community-minded protector, especially around young ones and when the group's safety is at stake. Beyond the books themselves, the fox’s arc ties into bigger themes I love: what makes someone part of a family, how identity adjusts under pressure, and how technology and nature can coexist. Even if the fox never gets a huge spotlight scene, the cumulative effect is an arc you feel: suspicion → curiosity → trust → responsibility. That progression makes the world feel lived-in and honest, and it’s the sort of subtle character work I come back to again and again. Reading it, I end up smiling at little animal gestures and thinking about how change often arrives in tiny, stubborn steps — kind of like the fox, actually.

Someone in my online reading group called Lily's arc a 'masterclass in unreliable narration turned reliable.' We're in her head, and at first, she's an unreliable narrator to herself, minimizing, justifying. As her arc progresses, her internal narration becomes brutally honest. She stops lying to herself. That's the character development. Ryle, conversely, remains an unreliable narrator to the very end, both in his dialogue and in how Lily perceives him until the final break. We see his charm, then his violence, and we (like Lily) are left to reconcile the two. His arc is the revelation that the charming man and the violent man are not two sides of a coin; the violence is part of the whole man. Lily's journey is accepting that irreconcilable truth.