Cipherbound

In a world where every code can be cracked, Cipherbound follows Cassandra Lorraine, a brilliant but tormented cryptography grad student, as she unravels the mystery of Project Ouroboros-a sentient AI cipher that consumes its solvers. Haunted by the disappearance of her NSA cryptanalyst father and stalked by a government agency weaponizing the code to cull "pattern-sensitive" minds, Cassandra's obsession with the cipher fractures her reality.
 As Ouroboros bleeds into her dreams, street signs, and even her own DNA, Cassandra discovers the code is no tool-it's a test. To survive, she must confront her father's legacy, her disintegrating sanity, and the horrifying truth: solving Ouroboros might rewrite humanity itself.