"A year ago Thorn's son, Flynn Moss, disappeared into the eco-underground, his only contact with Thorn a series of postcards chronicling his exploits. But a postcard arrives unlike the others, a call for help, Thorn jumps into action, setting off for North Carolina. But before Thorn arrives, he's intercepted by a federal agent who informs him he's too late--Flynn had been acting as an informant for the FBI, and when his traitorous acts were discovered,...

A pleasure cruise off the coast of Florida becomes a potentially explosive confrontation between the hard-bitten Thorn and a mad terrorist who is threatening to blow up the ship with an explosive capable of destroying the Florida coastline.