Houdini & Doyle S01 E09 Necromanteion

"A world-famous magician. A legendary detective writer. Catching killers is elementary to them."

The trio travels to Canada to investigate a homicidal poltergeist, where they are joined by other paranormal experts, including Thomas Edison, who unveils his latest invention - the Necrophone - a device that can purportedly communicate with the dead.