Ep. 12: Holmes and Lupin uncover the truth behind the Black Drawing Room trap and the Raven's treasure.

Lupin, Holmes, Lily, and Zenigata survive an explosion, realizing the Black Drawing Room was a booby trap. Holmes deduces that the cheap ring Faulkner wore is the key to the treasure. A man steals the ring to unlock a gravestone leading to a secret passageway but is cornered by Holmes, Lily, and Lestrade. Holmes recognizes the thief as Eliot. A gunfight ensues, and Lupin shoots Eliot, claiming he killed Lily's father. Holmes and Lupin shoot at each other, allowing Lily to recall seeing Lestrade before her father's murder. Holmes reveals he set the trap to expose Lestrade. Lestrade threatens everyone with hand bombs, but Lupin reveals the Raven's treasure is merely useless WWII bombs. Frustrated, Lestrade escapes into the Thames River, detonating the bombs. Lupin reveals Watson's final request was for Holmes to watch over Lily. Later, Holmes resumes high-profile cases with Lily as his partner. Lupin meets James Morarity, the mysterious Professor, who warns him to stay away. Lupin decides he has had enough of London and departs.

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