Inventor Nikola Tesla assists Murdoch in an investigation into the passing of a man experimenting with invisibility.
s12e01 - Murdoch Mystery Mansion
s12e02 - Operation: Murder
s12e03 - My Big Fat Mimico Wedding
s12e04 - Murdoch Without Borders
s12e05 - The Spy Who Loved Murdoch
s12e06 - Sir. Sir? Sir!!!
s12e07 - Brother's Keeper
s12e08 - Drowning in Money
s12e09 - Secrets and Lies
s12e10 - Pirates of the Great Lakes
s12e11 - Annabella Cinderella
s12e12 - Six of the Best
s12e13 - Murdoch and the Undetectable Man
s12e14 - Sins of the Father
s12e15 - One Minute to Murder
s12e16 - Manual for Murder
s12e17 - Darkness Before Dawn (1)
s12e18 - Darkness Before Dawn (2)
The series takes place in Toronto in the 1890s and follows Detective William Murdoch of the Toronto Constabulary, who solves many of his cases using methods of detection that were unusual at the time. These methods include fingerprinting, blood testing, surveillance, and trace evidence.
Detective Murdoch is assisted by the three other main characters: Inspector Brackenreid, Doctor Julia Ogden, and the inexperienced but eager Constable George Crabtree, who aspires to be a mystery-novel writer. Brackenreid, Murdoch's immediate superior, is a blunt and sceptical Yorkshireman with a fondness for whiskey, and prefers conventional methods of detection over Murdoch's eccentric methods, though he is typically pleased and proud when Murdoch is successful despite the odds. Crabtree is often unable to grasp the more advanced methods, but his enthusiasm and loyalty make him a good assistant. Like Crabtree, Dr. Ogden is a great supporter of Murdoch's methods. Her skill in pathology usually helps by revealing a great deal of useful evidence to aid Murdoch in solving cases.
Throughout the series Murdoch's growing infatuation with her, and his inability to express his feelings, provide a light subplot. In the fifth season, after Dr. Ogden is married to Dr. Darcy Garland (a colleague she met in Buffalo), a new doctor is introduced, Dr. Emily Grace. She and George Crabtree show some romantic interest in each other.