Her razor-sharp mind and ability to decipher evidence have made Avery Delaney an expert crime analyst for the FBI. Now she will have to use every one of her skills on a case that hits painfully close to home.

Avery's beloved aunt Carolyn was on her way to a posh spa in the Colorado mountains. But she never arrived. Now, with scant clues and fewer resources, Avery must track down Carolyn—and outmancuver a brilliant killer named Monk who is part of an elaborate plot of madness and lethal vengeance.