Hidden in the Northern California woods, a remote hunting cabin conceals a horrifying secret that could upend FBI Special Agent Sadie Gray’s life. Grass Valley, a quiet community with dark undercurrents, was the site of Sadie's abduction nearly twenty years ago. Now, as a gruesome discovery ignites a murder investigation tied to a prolific serial killer dubbed “The 34 in the Floor,” Sadie must confront her past and delve into the mind of a murderer to uncover the truth and bring the killer to justice. 5.0 stars, 18 ratings. From $0.99. Free via KU. SHOP NOW /