Detective Murdoch fears that his relationship with Dr. Ogden has been permanently damaged, as he heads into investigating a seemingly perfect crime, the murder of a university professor. Meanwhile, Constable Crabtree continues his search for his biological mother.

Murdoch finds himself drawn to the widowed mother of a boy who has gone missing, but the case starts to take a strange turn involving spies, midgets and a robotic super weapon.

Murdoch finds himself with amnesia and running for his life on the streets of Bristol, England, very far from home, if he knew where his home was. Taking refuge in a pub, he gains the assistance of a vivacious barmaid who helps him reconstruct his memories, escape his pursuers, and foil an assassination plot.

Inspector Brackenreid and Constable Crabtree are present when a man undergoing the candlelit initiation ceremony in a Masonic Temple is murdered. Murdoch's investigation uncovers another even-more-secret society.

Murdoch makes a surprising discovery at a dolls house fair; in one of the houses the artist has placed a hand firing a gun. This is no ordinary model - it’s a crime scene. Murdoch finds the creator of the streetscape, an autistic 19-year-old, Lydia, who communicates best through model building. No one has reported a murder yet, but using the model’s intricate clues left by Lydia, Murdoch discovers that someone indeed has been killed – but what happened and why? Someone is far from happy by his investigations and things begin to get even more sinister in the neighbourhood.