It's not a phenomenon Special Agent Tom Hannah has encountered before. Respectable single women who adopt a promiscuous lifestyle overnight - and then vanish. Among the missing are an elected county judge, a high-school teacher, a Wall St banker - and Felice Cody, a US government scientist. And now the government wants her back... But Hannah needs help. It comes in the shape of his new partner, Bonny Jarvis, a redhead with ice-water in her veins and a hard disk for a heart. For Agent Jarvis is an expert on a world where the Erotic meets the Unexplained, a secret archive known as: the sex files.