[Sequel To Property Of Billie Eilish] Three years ago, Billie disappeared in a fire that should've taken her life. Everyone thought she was dead-except Riley. Grief-stricken and obsessed, Riley has spent every moment since searching for the girl who taught her how to love... and how to burn. When Riley finally finds Billie in a psychiatric institution, alive but unrecognizable, the reunion is anything but romantic. Billie is medicated, erratic, and unreachable. Riley is bitter, broken, and smoking herself into ruin. What follows is a sharp, spiraling descent into obsession, guilt, and fractured loyalty. Riley can't stop visiting. Billie can't decide if she wants her there. And between insecurity, violent outbursts, and long-forgotten secrets from the night of the fire-both girls must face the one question neither of them is ready to answer: Is love still love when it starts to hurt? Insanity is a dark, emotional novel about mental illness, toxic romance, and the blurred line between devotion and destruction.