Young FBI agent Nicole Bonnet receives a mysterious package Inside she finds a complicated logical puzzle that appears to be a message from a serial killer This is just the beginning of an epic duel of minds between Nicole & the ruthless murderer who leaves playing cards by the bodies of his victims as signature Bonnet will have to use all her wits to solve the case & stop the murderer before he strikes again Does she have what it takes to understand the mind of a psychopath as complicated as his puzzles? Dark plot full of twists Challenging puzzles that require logical thinking Pieces of evidence that need to be found & analyzed Detailed locations from various places in the United States