1950s adventure in which the captain of a ship moored off the coast of Spain finds himself embroiled in a love triangle. Captain Bellew (Victor McLaglen) is in charge of a tugboat that currently operates from a small Spanish village. A crafty local tries to tempt the captain into a liaison with his daughter, Josita (Luciana Paluzzi), in the belief that Bellew will die soon and leave them money. However, Josita has fallen in love with one of Bellew's crew, Abel (Stanley Baker). A situation of even greater explosive potential arises when Bellew receives a call to tow in a boat carrying dangerous cargo...