"Cahills are being kidnapped by a shadowy group known only as the Vespers. Now Amy and Dan have just days to fulfill a bizarre ransom request or their captured friends will start dying. Amy and Dan don't know what the Vespers want or how to stop them. Only one thing is clear: the Vespers are playing to win, and if they get their hands on the Clues the world will be their next hostage"--P. [4] of cover.

Aiden works with the FBI in order to rescue his sister Meg, who was kidnapped. Aiden Falconer and FBI Agent Harris are closing in on the people who kidnapped Aiden's sister, Meg. She is trying to escape and making it difficult to rescue her and all are in grave danger.