The team is in turmoil, with Detective Murdoch and Ogden abducted, Inspector Brackenreid retired to England, and Constable Crabtree left to root out corruption at the station house. Soon they'll be back to solving Toronto's most mysterious murders.
Murdoch and Ogden have been abducted, and now baby Susannah's life is at stake unless they can get the murder conviction of a socialite overturned. After ridding the station house of its corrupt leadership, Crabtree is appointed interim inspector.
Murdoch and Ogden have managed to exonerate a socialite convicted of killing her husband, but they have qualms about their actions. Brackenreid contends with an attack on Margaret, and Crabtree grapples with a murderous vigilante.
After a man is bludgeoned aboard a ship, Murdoch learns the victim was a suspect in the recent theft of the "Mona Lisa" from the Louvre. His inquiries lead him to other artistically inclined passengers, including one who spent time in a sanitorium.
Brackenreid's rowdy bachelor party for Constable Tucker takes a violent turn when a drunk patron is found dead in an oyster barrel. Making matters worse, Tucker had an altercation with the victim earlier in the evening.
While sauntering through a street fair, the team are intrigued by a mechanical fortune-teller but warned that any requests they make on it will definitely come true. After Ogden wishes for fewer obligations, she gets more than she bargained for.
When Ogden visits a country health retreat with Effie, she's skeptical yet intrigued by its alternative practices and charismatic leader. But after one of the longtime guests suddenly dies, the relaxing getaway turns into a murder mystery.
Ogden meets Hart at the stables to see her horse, Cool Million. The thoroughbred was one of the few assets Hart salvaged in her lawsuit with her late husband's family. But when another racehorse is found dead in his stall, Hart suspects foul play.
On a ladies' getaway in the woods, Ogden, Hart, Effie, and Louise Cherry encounter a troop of girl adventurers whose leader has been stabbed by a madman. In Toronto, Murdoch and Watts investigate a convict lured to his death by a fake love letter.
A dead body rolls out of Santa's toy sack at a department store Christmas parade. Stuffed into the man's mouth are $10 bills with "naughty" scrawled on them. The parade marshal blames the store's rival, but it appears the victim was quite a Scrooge.
When a construction company owner is shot dead at a barbershop, Murdoch suspects a professional assassin, despite the barber and the victim's father claiming the deceased was well liked. Meanwhile, an injured and bored Effie spies on her neighbors.