Drama series based on the lives and friendship of Harry Houdini and Arthur Conan Doyle. A businessman is thrown from a window on the seventh floor by a shadowy phantom with demonic red eyes, capable of leaps and bounds that defy gravity. From the description of the eyewitness, the phantom is eerily similar to Spring-Heel'd Jack, a mysterious entity that has plagued the streets of London over the past hundred years. As more attacks occur, Houdini and Doyle cannot agree on whether it is the work of a supernatural being or someone exploiting an urban legend in order to fuel mass hysteria in a fearful public. Complicating the investigation is a tabloid reporter who sensationalises the story in order to sell more papers, creating more panic.