Emma finds a notebook in her dead mother's belongings and makes one mistake: she writes in it.
Within hours, her sister Mira starts remembering camping trips that never happened-vivid, foundational memories of trust Emma knows are completely false. The notebook grafts memories between timelines, pulling fragments from other versions of their lives. Every entry Emma writes costs her something irreplaceable. To stabilize Mira, Emma must sacrifice her own memories: the moment she chose to become Mira's protector, the origin of why she loves her at all.
But love without memory is just programming. And somewhere in the past, another version of Emma is writing through the same notebook, moving toward collision. When they meet on page 134, both will disappear into something new-whole, but no longer themselves.
A devastating literary thriller about identity, sacrifice, and the cost of saving people who don't ask to be saved.