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A mix of easy, medium and hard — questions run from warm-up to expert, so there's a real challenge at every level. Think you know the answers? Play to find out.
This loyal friend and former army doctor serves as Sherlock Holmes's assistant and the narrator of most stories.
Difficulty: EasyThis 1915 novel is the fourth and final Holmes novel, involving a murder connected to a secret American society called the Scowrers.
Difficulty: MediumJonathan Small hires this fast steam launch owned by Mordecai Smith to escape down the Thames, leading to a famous boat chase.
Difficulty: HardThis iconic London address is where Sherlock Holmes rents rooms from his landlady.
Difficulty: EasyColonel Sebastian Moran uses this specially constructed silent weapon that fires revolver bullets to attempt to assassinate Holmes.
Difficulty: MediumTrevor's father was a mutineer aboard this convict ship bound for Australia, a secret that haunts him when fellow mutineer Hudson reappears.
Difficulty: HardThis Scottish physician and writer created the world's most famous detective in 1887.
Difficulty: EasyThis naturalist-disguised villain in The Hound of the Baskervilles is actually a Baskerville heir using a trained hound to murder relatives.
Difficulty: Medium