The TARDIS takes the Doctor and Turlough to the London of 1702 where a mysterious highwayman roams the streets, a local occultist has made contact with the dead, and gentlemen of fashion are disappearing, only to find themselves in a chamber whose walls weep blood.
The time-travelers become enmeshed in the hideous plan of Sir Nikolas Valentine, a gambler at the mysterious Diabola Club who always seems to have a winning hand.
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