Set in England during the late Victorian era, famed author Arthur Conan Doyle must push aside his scepticism of the supernatural with the emergence of Spring-Heeled Jack, a mysterious phantom of urban legend.

This sets in motion the revival of The InSpectres, a secret society devoted to the investigation of the occult originally formed by Charles Dickens, and brings together, alongside Doyle, Harry Houdini, Bram Stoker and ten-year-old Agatha Christie to try and save London from a deadly, paranormal event.