London. A mysterious serial killer brutally murders young blond women by stalking them in the night fog. One foggy, sinister night, a young man who claims his name is Jonathan Drew arrives at the guest house run by the Bunting family and rents a room.

When wistful introvert Alan Furnace meets quick-witted bombshell Beatrice, he has no idea of her secret life as "B. Monkey" -- the top thief-for-hire in London's criminal underworld. Charmed by Furnace's innocent and chivalrous ways, Beatrice resolves to reform. But to cash in on her first chance at real love, she must escape her forme...

As American policemen in London, Bud and Lou meet up with Dr. Jekyll and Mr. Hyde.

The Belgian detective Hercule Poirot investigates a series of murders in London in which the victims are killed according to their initials.

A serial killer named The Shark is terrorizing London by killing his victims with a speargun and then, dressed in a scruba-diver's wetsuit, using the city's sewer tunnels to make his getaway.