Andy Carpenter has been involved in a county prison program where inmates help train dogs the Tara Foundation has rescued to make them more adoptable. One prisoner, Brian, is helping a dog named Boomer and they have grown close, so close he uses Boomer to help him escape. The next day, the man on whose testimony Brian was convicted is found murdered. Brian is caught and arrested for the crime, though he forcefully protests his innocence. Suddenly, Andy finds himself with a new client in Brian and a new dog in Boomer. As he starts to dig deeper into the murder and the events leading up to it, Andy realizes he might be putting them all in far more danger than anyone had realized.