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Disguised as Ito Matsuka, Japanese murderer Kentaro Moto, an agent of the International Police, leads Paul Brissac, a Frenchman, in an escape from Devil's Island. In London, Moto becomes a houseboy for Brissac, a member of a group of hired killers of diplomats and economic leaders, which the newspapers have dubbed "The League of Assassins." Moto is trying to learn the identity of the group's leader and the reason that they are in London. Meanwhile, Prague steel king Anton Darvak, a pacifist, has refused to sell to armament manufacturers a formula for a new type of steel. After he receives a threatening telephone call at his London hotel, Moto learns of the call from one of his agents, Lotus Liu. On his way to visit Darvak, Moto witnesses a lorry back up and kill a man in a street market. Darvak at first refuses to tell Moto about the threat against his life, despite the urging of his secretary, Ann Richman, and his business associate, David Scott-Frensham. However, when he learns that the man run down by the lorry, Lord Gilford, was killed as a warning to him, Darvak confides to Moto that he was told he would be killed the next afternoon at three if he does not part with the formula. Moto visits the Limehouse tavern where Lotus lives. After he hears the accordion player play the same tune that an organ grinder played before Lord Gilford was killed, a brawl begins. Moto takes Lotus to her room to pack, and they find the body of a member of the league, who was killed because he confided in Lotus. At Brissac's residence, Ernst Litmar tells Brissac that Moto was seen in the bar speaking with Lotus. They send Moto to a certain store for fruit, and when Moto gets there, he hears a street violinist play the tune he heard before the two previous murders. A number of toughs crowd around him, but he escapes in a cab. The next day, Moto goes to Coventry Galleries, knowing that Darvak plans to be there that afternoon at three to see an exhibition. He overhears Litmar explain to Brissac the plan to kill Darvak: the leader of the group will position Darvak in front of a particular painting and say his name in a loud voice; the orchestra will then play the same tune used previously to identify men to be murdered; Brissac, in the gallery loft, will cut the chandelier, and its fall will kill Darvak. After Ann tells a surprised, but very pleased Darvak that she loves him, Moto visits. David also arrives and says that he has brought two men from Scotland Yard to protect Darvak. When Moto is stopped by the two plainclothesmen in the hall, he sees that one of them has a gun and knocks them over a bannister. As three o'clock nears, David arrives alone at the gallery, and as he stands in front of the painting, an eccentric German artist complains about the art exhibited. When Darvak arrives with the plainclothesmen, the crank artist loudly calls David "Darvak," and the orchestra plays the tune. Brissac cuts the chandelier, and it kills David. The crank artist then removes his disguise and reveals himself to be Moto. He explains he knew that the leader must be David because the plainclothesmen had guns, while Scotland Yard officers do not carry any. As the gang is apprehended, Brissac shoots from the loft, but Moto fights and subdues him.