Deaths under mysterious circumstances create paranoia among the men, and some of the crew may be considering mutiny.

A cunning attack on the ships proves the men are not battling an ordinary bear and that the region’s Inuit culture may hold a key to their survival.

With something now stalking the ships, the captains debate their options, testing their loyalty to one another against their duty to their crews.

After a long winter trapped in the ice, scouting parties are sent out in search of open water. One of the teams makes a frightening discovery.

An accident at sea cripples a Royal Navy expedition 200 miles from finding the Northwest Passage, forcing its captains to make dire choices.

Holmes and Watson travel to Europe to escape Moriarty’s vengeance.

Sherlock faces perhaps the most chilling enemy of his long career: the powerful and seemingly unassailable Culverton Smith – a man with a very dark secret indeed.

Sherlock waits to see where Moriarty will make his posthumous move. One mysterious case in particular baffles Scotland Yard – but Sherlock is more interested in a seemingly-trivial detail. Why…