Driven (Gavin Pierce Series #1)

Lobster fisherman Karl Dengler is inhabited by the demon Krogan, and partners with other demon-possessed people to commit horrific acts of violence. When Krogan destroys the New York Aquarium's tanks of whales and dolphins, Det. Gavin Pierce's grandfather is one of the spectators killed. In his quest for vengeance, Gavin joins forces with Amy Kirsch, a sassy, drop-dead gorgeous computer hacker who has a homespun fortune cookie saying for almost every occasion.