The Interval Between. Young Adult Fiction, #1

Seventeen-year-old Seren Ashveil has spent nine years pretending the strangeness inside her is manageable. She sits on the Aldenmere Bridge listening to a river that remembers what the city tried to bury, writes everything down in a notebook, and tells herself that reading the weather and knowing when someone lies are just interesting neurological quirks from a childhood near-drowning. She is very good at pretending.
Then a letter arrives in blood-dark wax, unsigned, with two sentences that refuse to let her continue: You have been found, Seren Ashveil. Stop pretending you haven't. Before she can decide whether to run, a boy named Caelum appears with the truth: Seren didn't nearly drown nine years ago. She drowned completely. And she came back carrying stellar essence from the moment between dying and rebirth, a presence so concentrated that it has spent nine years transforming her into something between human and divine.
The Astronomers of the Third Veil have been waiting for her. They believe she is the key to restoring a mechanism that has been holding the divine and mortal frequencies apart for two thousand years. But someone else is also looking for her, someone who has been stealing stellar essence from the Veil's sustaining stars to build a door of their own, and they want what Seren carries. She has four months before the Veil fails entirely.
She has no idea what will happen to her if she gives up the essence that has become part of her. And she has Caelum, who holds on without letting go, and a river that keeps insisting on the truth, and a notebook full of things she's finally allowed herself to see. The Interval Between is a YA Romantasy about what it means to stop pretending, about carrying something that doesn't belong to you and being transformed by it anyway, and about the people who stand at the boundary between frequencies and choose to listen.
Perfect for readers who love: Quiet protagonists who observe more than they speak Slow-burn romance built on genuine connection and resonance Mythology that lives inside the modern world Stories about the spaces between things and what they contain Found family of people doing difficult work together Layered worldbuilding that reveals itself gradually Atmospheric settings where the environment is almost a character YA that trusts its readers to follow complexity without hand-holding