The Problem of the Spiteful Spiritualist

A sea captain lies dead, the victim of a murder with otherworldly dimensions
The reverend Charles Dodgson comes to Portsmouth hoping for rest, relaxation, and a few days' peace in the company of his friend Arthur Conan Doyle, physician and aspiring author of mysteries. But within a minute of their reunion, Doyle is talking about murder. One of his patients, a gout-ridden ex-sailor, has dropped dead in his study, and Doyle is not convinced by the coroner's verdict of natural causes. Besides being the author of Alice in Wonderland, Dodgson is a renowned mathematician, and Doyle begs him to use his deductive brilliance to find the man who snuffed out the old sea dog.
When an Indian raja arrives to accuse the dead man of stealing treasures from India, a local mystic volunteers to help unravel the case. Doyle and Dodgson are wary of taking help from a psychic, but they will soon find that it may take more than logic to solve this case.