Detective Murdoch investigates the apparent murder of an inventor who is found sitting in a chair he invented. That chair was meant to provide a mild electrical current as a rejuvenation technique but Dr. Grace is certain that he was in fact electrocuted. He had a young woman with him the night he died but the investigation leads him to inventor Thomas Edison and the main suspect - his son Thomas Edison Jr. Meanwhile, the mayor tells Inspector Brackenreid to speak to Murdoch about Julia's plans to run in the upcoming election - fully expecting he will exercise his authority as her husband. Murdoch makes it clear to everyone that he has no intention of interfering and will support Julia in her campaign.

While investigating a mysterious death in Markham, Det. Murdoch discovers a hidden ornate and booby-trapped laden building that could contain the Holy Grail.

During a women's fashion show for undergarments, a model is found dead.

Brackenreid's abrasive nephew joins Station 4's crew just as Murdoch investigates a gang of female jewel thieves who seemed to have just murdered their ringleader.

George Crabtree investigates a suspicious death in the world of entertainment wrestling.

Julia and her colleagues are going to vote for a female candidate as a gesture for women's suffrage; meanwhile, Murdoch investigates the death of a man who may be one of Terrence Meyer's minions.

During a hunt for a killer who collects macabre trophies, Murdoch becomes a target. Meanwhile, Crabtree discovers the recently returned formerly presumed dead husband of his love is an abusive brute.

Murdoch investigates a prison stabbing which may be connected to the murder for which George Crabtree is imprisoned.

As a visit to Toronto for a speaking engagement by Mark Twain leads to controversy, Murdoch and the team from Station House 4 are tasked with protecting him.

It is the eve of Dr Grace's departure for England, when a young suffragette is murdered. Murdoch is called to investigate.