51: Monsters is book three in the 51 series. 51: Monsters Sheriff Lindsay Gold thought she had enough to worry about in her county, and then the only monster she knew existed shows up, her mother-in-law. While her husband, Agent Wren Gold is away on assignment, Lindsay must contend with both Marget Gold and a new deadly threat. This new threat leads Wren to many more questions about what is taking place in the county and from where some of the creatures have come. Deputy Max Cartwright makes an accidental and unnerving discovery about the Sheriff's first husband, James, which could turn everyone’s world upside down. Things may be very different from what they have appeared, and now the search for the truth begins.