The Mammoth (The Mammoth #4)

Trapped in a basement with Sheriff Hirly Maple's raving zombie of a boyfriend, Jess - along with her undead girlfriend Olivia, and her very much still living friends Mason and Kokoro - learn about the hidden supernatural history of Broke Tree Valley and the Mammoth. Unfortunately, none of this newfound knowledge will help if they can't put a stop to the sheriff's sinister plan. Olivia seems to know the path to the Mammoth... but does she know a way out of this one?