In Philadelphia in the early 19th centry, Robby Hare's father forces him to help with an unthinkable task-robbing newly filled graves of their contents to sell to the medical college. Despite his interest in the doctor's research, Robby swears never to rob another grave, even if his mother relies on the money they bring in. When William Burke and his daughter, Martha, come to live at their boarding house, Robby's father becomes caught in a broader web of evil. Could his father and Burke be murdering people to provide bodies for medical science? Determined to expose their scheme, Robby must be brave enough to enter the graveyard one more time.