Black, a Frenchman with African roots, commits in France a heist with some complices. The early arrival of alarmed police kindles a shooting. Blacks complices are killed and he can only scarcely escape by jumping from a bridge onto a running train. When he is all alone in his hideout, he receives a long-distance call from a cousin in Africa. Black is asked to rob diamonds from a bank. His cousin makes him believe this was easily done.