A young mariner takes charge of a ship in the far east (Bangkok) when the previous captain dies. The crew are sickly and unfriendly, the ship has no provisions, and there are delays in getting under way. He befriends Hermann, the captain of the Diana, a German ship which is moored nearby. Hermann lives on board with his wife, his four children, and his niece - who is a simple but physically attractive young woman. Also passing time with this family is Falk, the captain of a tug with a monopoly of navigation on the river leading out to the coast.