Two free adventurers for their own selfish purposes are hired by a representative of another alien race with the help of threats to perform deadly work. In the process of completing the assignment, they get acquainted with the third member of the crew. Upon returning aboard their ship, they find themselves involved in a whole chain of events: captivity, escape, passage through the "Black Hole".
After returning to their home galaxy, they are forced to become pirate assistants. But in the end, good triumphs over evil.