Unscrupulous boxing promoters, violent bookmakers, a Russian gangster, incompetent amateur robbers and supposedly Jewish jewelers fight to track down a priceless stolen diamond.
Eddy persuades his three pals to pool money for a vital poker game against a powerful local mobster, Hatchet Harry. Eddy loses, after which Harry gives him a week to pay back 500,000 pounds.
Detective Sherlock Holmes and his stalwart partner Watson engage in a battle of wits and brawn with a nemesis whose plot is a threat to all of England.
When a Russian mobster orchestrates a crooked land deal, millions of dollars are up for grabs, drawing in the entire London underworld into a feeding frenzy at a time when the old criminal regime is losing turf to a wealthy foreign mob.