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After a line of mischief Philip Gale, an American sailor, is lured into hiring on the "Yorikke", a tramp cargo, by Lawski, a stoker from Poland. Still, the two become friends within the motley crew of losers from all nations.

Gale and his new companion soon are more than disillusioned: the "Yorikke" is far from seaworthy and more of a coffin than a ship, work is close to slavery, and treatment by the officers and their subalterns is harsh and cynical.

One day they make an alarming discovery in a tin of plum butter they have procured from the ship's cargo.