The story of Johnny Chicago's brother, Ray, and his friend Chuck Moreno, both petty criminals. The latter wants to take the ashes of Johnny, who was fatally wounded by the police after a bank heist, to Chicago.
The title of the film, set in Luxembourg in 1942, during the Nazi occupation, amalgamates the words Schacko (helmet) and chapeau claque (opera hat). The village, in which it is set, has not yet been feeling the effects of the war at this point.
