A sea-faring man all his life, Captain Whalley's change in fortunes sees him captaining a steady, sturdy steamer, the Sofala, for a grasping and unpleasant owner--Whalley's only choice if he is to continue to support his family. But Captain Whalley is becoming increasingly unfit for the post and an ambitious young mate has seen his chance to progress. However, Massy, the increasingly dissatisfied owner of the Sofala, has sabotage in mind.