Nayland Smith and his associates use some maps and detective work to deduce the entrances and location of Fu Manchu's hideout. With the intent of flooding the hideout, they break in through the hidden entrance in Hanuman's warehouse. They confront Fu Manchu and his minions, and a brawl ensues. After the lights go out, Fu Manchu and his minions escape to a Tibetan monastery with Professor Muller while the River Thames hideout is flooded. Nayland Smith and his team leave the underground hideout via an exit that leads to a graveyard.