Help pe find this book whose plot follows as: A girl's(let's call her x) sister was found dead in order to find her sister's murder x decided to change her whole appearance and started visiting the same therapist that her sister used to visit before her murder as the story flows she starts getting confused between what's true and what's not true and everything that she used to believe seems to be a big lie X alose comeforth as an unreliable narrator This was a recommended from a short but now I can't find it Plz someone help me find