A university professor from England is shot in the head through his window either looking at a comet or being a voyeur with a beautiful coed.

The kidnapper of a young girl leaves a talking doll in her room which is diabolically designed to lead Murdoch on a quest that is designed by a manipulative, enigmatic and vindictive criminal from the detective's past.

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

With his colleague sentenced to hang for murder, Detective Murdoch races to exonerate them and steps into a trap set by the real killer.

Detective Murdoch, Inspector Brackenreid, Dr. Ogden and several others are transporting serial killer James Gillies to the prison in Kingston, Ontario where he is scheduled to be executed the next day. It creates a bit of a stir among the passengers when they learn who is being transported. Among them are Aaron Rauls, a late arrival on the train and Nathaniel Henry. Both come under suspicion when the police find a dead man, Dennis Bolton who was released from the Don jail just a week ago. There's no direct connection between Bolton and Gillies but both were in the same jail at the same time. As tensions rise, it becomes evident that Gillies has arranged for several ex-convicts to be on the train - all part of his plan to escape.

On his deathbed, Jeffrey Roundhill confesses to having killed his wife Evelyn some 8 years before and tells Murdoch where to find her remains. Dr. Grace confirms the identity of the skeleton as that of Mrs. Roundhill but the manner in which she died doesn't match Roundhill's statement. Further investigation reveals that Roundhill was actually in Winnipeg on the day his wife disappeared. Julia recalls a case, that of Amelia Thompson, who was killed just as Roundhill describes. At the time, Murdoch was convinced that her husband was responsible for his wife's death. Could the two men have killed each other's spouse? Meanwhile, George Crabtree hasn't seen much of Emily lately and takes Leslie Garland to task for interfering in their relationship.

Detective Murdoch and station house 4 employ a con woman to catch an elusive murderess. Doctor Ogden receives a threatening note from beyond the grave, or is it? Doctor Grace and George hit turbulence in their relationship when she is forced to 'ad-lib' during the performance of her life. Was she acting? Murdoch and Julia hit yet another snag in their already complicated relationship. William decides to forge ahead much to Julia's consternation.

A murderer claims to be possessed by the spirit of Murdoch's arch-nemesis, James Gillies. Murdoch and Ogden begin to suspect that Gillies may still be alive.

Detective Murdoch, Inspector Brackenreid, Dr. Ogden and several others are transporting serial killer James Gillies to the prison in Kingston, Ontario where he is scheduled to be executed the next day. It creates a bit of a stir among the passengers when they learn who is being transported. Among them are Aaron Rauls, a late arrival on the train and Nathaniel Henry. Both come under suspicion when the police find a dead man, Dennis Bolton who was released from the Don jail just a week ago. There's no direct connection between Bolton and Gillies but both were in the same jail at the same time. As tensions rise, it becomes evident that Gillies has arranged for several ex-convicts to be on the train - all part of his plan to escape.

The kidnapper of a young girl leaves a talking doll in her room which is diabolically designed to lead Murdoch on a quest that is designed by a manipulative, enigmatic and vindictive criminal from the detective's past.

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

A university professor from England is shot in the head through his window either looking at a comet or being a voyeur with a beautiful coed.

With his colleague sentenced to hang for murder, Detective Murdoch races to exonerate them and steps into a trap set by the real killer.