Murdoch teams with his hero, Arthur Conan Doyle, to solve a murder that was revealed during a séance led by medium Sarah Pensall. It seems the victim, Ida Winston – a member of a paranormal watchdog group – had not been convinced of Sarah’s abilities, which makes Murdoch wonder if Sarah killed Ida because she was about to be revealed as a fraud. Despite mounting evidence of the spirit world, Murdoch remains determined to use scientific means to solve the case. Sure enough, evidence starts to stack up against Sarah’s little toady, Lisgar Gall. But when Murdoch accuses Gall of killing Ida in order to protect Sarah, he winds up in the middle of an unexpected lovers’ triangle that further complicates the case.