Two ex-Navy guys set out to put the brakes on a dope smuggling ring.

Kate Soffel is married to a prison warden in Pittsburgh, and is the mother of their four children. Ed Biddle is a convicted murderer awaiting execution on death row with his brother Jack. When Kate meets Eddie through her Bible readings to the prisoners, she is drawn to him, and they pursue a clandestine relationship. She agrees to help the brothers escape, and begins a treacherous journey with them to freedom in Canada.

Corn grain contaminated with steroids produces large rats the size of small dogs who begin feeding on the residents of Toronto. Paul, a college basketball coach, teams up with Kelly, a local health inspector, to uncover the source of the mysterious rat attacks and they eventually try to prevent the opening of a new subway line as well as find the mutant rats nest quickly, or there will be a huge massacre of the entire city!