At eighty- seven, Marvin's eyesight is failing, but even he can't miss the bruises on his fellow nursing- home residents. The staff dismisses his concerns, so Marvin enlists the aid of two friends to expose the abuser. Armed only with their cunning and a collection of homemade weapons, they stalk suspects, collect documents and set booby traps. Probing deeper, they uncover a deadly corporate conspiracy designed to reclaim the nursing home's real estate.