Four days before Christmas in Edwardian-era Toronto, Detective William Murdoch is called to investigate a daring train robbery. When witnesses insist the culprit exhibited superhuman abilities, Constable Crabtree realizes the robber bears a striking resemblance to the title character of his new graphic novel, Jumping Jack. As more robberies targeting gifts from Eaton's luxury department occur around Toronto, Murdoch and his team are forced to consider the possibility that Crabtree's character has come to life. As Station House No. 4 contends with a real-life Jumping Jack, Inspector Brackenreid orders the formation of a police choir, and Dr. Julia Ogden tries to help two orphans who mistake her for a fairytale heroine.