Sadie by Courtney Summers is an utterly unique thriller told through podcast transcripts and the voice of the book's titular character as she searches for her sister's killer. When podcast host West McCray gets a call from someone begging him to find 19-year-old Sadie, he has no idea just how dark her story is. Meanwhile, Sadie is on a journey to track down the man who killed her little sister, and she won't stop until she makes him pay.