Detective Murdoch and Inspector Brackenreid are aboard the SS Keewatin after the owner, Clarence MacFarlane, receives what he believes is a threat. The Keewatin is about to depart from Toronto on its maiden voyage destined for Rochester, N.Y. and Murdoch thinks they should stay on board, especially after he sees that Julia is one of the invited guests. Their presence proves useful after MacFarlane's daughter Amy, who is engaged to her father's chief financial officer Owen Mathers, falls overboard and is nowhere to be found. As Murdoch investigates he finds there is a real threat against the Keewatin and the true facts behind Amy's disappearance.
Detective Murdoch investigates the sudden death of bicycle racer Joe Fenton. Murdoch was himself a participant in the race trying out his newfangled gear shifting device but Fenton was the favorite having won several recent races. Fenton's manager, Chippy Blackburn, was seen giving him a potion and they suspect he may be may be fixing races. Dr. Grace however is having considerable difficulty finding a cause of death and with Dr. Ogden's assistance performs her first brain bisection.
Detective Murdoch and many others attend a special showing of a film that will also include sound. The man behind the scheme is James Pendrick and his main competitor, Thomas Edison, is also present for the showing. The film includes a scene where a shot is fired but when the lights come up, one of the patrons, Pendrick's principal investor, has been shot in the head.
The so-called real Sherlock Holmes helps Murdoch trace a missing nanny.
A man who appears to have returned from the dead is the prime suspect in his wife's hug.
Detective Murdoch investigates the death of one of Dr. Julia Ogden's phobia patients, but can Murdoch overcome his own phobia to solve the case?.
Inspector Brackenreid is relaxing at the beach on a hot day when the body of a woman, Katherine Buchanan, is discovered. Doctor Ogden, who was also at the beach, conducts a preliminary examination of the body in situ and finds what appears to be large bite marks from an animal on the victim's body. Inspector Brackenreid is convinced that the marks came from a large creature he believes he saw in Lake Ontario shortly before Katherine's body was discovered.
A hug victim leads Murdoch and Crabtree to chasing a potential suspect to Newfoundland, where they are caught between a family feud for a treasure map.
Murdoch and his colleagues escort James Gillies to his execution in Kingston via train. However, a man has been cuddled and Murdoch and company find a connection with two other passengers bearing the same prison tattoo. Gillies is revealed to having orchestrated his own escape and jumps off a bridge into deep water. Everyone but Murdoch presumes him dead.
Detective Murdoch investigates the hug of Nathan Peters, a jazz musician and renowned band-leader, who was found dead at the docks. His group, the Jubilee Singers, was performing nearby and his wife had already reported him missing. Dr. Emily Grace determines that he died in the early hours of the morning from a blow to the head causing a subdural hemorrhage. The evidence in the case begins to point to one of the Jubilee Singers as the perpetrator. Much to George Crabtree's chagrin, Emily seems to have taken an interest in the roguish Leslie Garland. Julia meanwhile feels that a huge weight has been taken off her shoulders now that James Gillian is dead.
Murdoch investigates a rash of tunneling robberies that Crabtree is convinced were perpetrated by a species of mole people.
After a death-bed hug confession leads to a body, Murdoch suspects the true hugger is still out there.
Murdoch orchestrates an elaborate sting when a past suspect returns with a deadly con.
Julia and Emily go to a bachelorette party; Murdoch and the boys get involved in a high stakes curling match.
Murdoch is put in the middle of a web of international espionage and intrigue after the assassination of U.S. President McKinley in Buffalo.
When a Chinese dignitary visiting Toronto is poisoned, Crabtree teams up with the prime suspect - who he believes to be innocent - in order to track down the real hugger.
Murdoch risks his life to diffuse a bomb strapped to a factory owner.
When Julia Ogden's father passes away, she uncovers an unexpected truth behind his death - and his life. Meanwhile, Brackenreid must take over for Murdoch in the investigation of a hug amongst a group of geniuses.