When software designer Kevin Cannon is killed of the coast of Nova Scotia in a boat rented from Evie Shaw's yacht harbor, Evie doesn't think it's an accident. She contacts Robert Cannon, Kevin's brother and the president of Boston's Thornhill Software. Robert is aware that an innovative product that Kevin developed has shown up in the catalog of a competing software design firm. Leaving his scretary Mrs. Beecham in charge of his business, Robert arrives in Nova Scotia to retrieve Kevin's body. He meets Evie and together they begin to solve the mystery. Hanging around the crime scene is Orrin Mercer, the head of production at Thornhill's local plant.