Battle Mountain is the 25th book in C.J. Box's Joe Pickett series, published in February 2025, featuring Wyoming Game Warden Joe Pickett investigating a missing governor's son-in-law while his friend Nate Romanowski seeks revenge off-grid, with their paths converging at "Battle Mountain". The thriller combines crime fiction, mystery, and suspense, focusing on Joe's investigation and Nate's quest for vengeance against a man who attacked his family.