Detective Murdoch suspects a soldier after a veteran is slain by a sword.

After the release of Murdoch and Ogden’s book, a series of copycat murders begin to take place.

Murdoch investigates an astronomical phenomenon with a strange impact on his colleagues’ behavior and dire implications for Toronto.

Detective Murdoch and his methods are compromised when one of his colleagues is implicated in a suspicious murder.

As they investigate a young woman’s death, Murdoch and Dr. Ogden find their relationship threatened when they turn out to be of opposite opinions in the matter of abortion.