Growing up in postwar Paris as the sickly only child of glamorous athletic parents, the narrator invents for himself a make-believe older brother, stronger and more brilliant than he can ever be. It is only when the boy begins talking to an old family friend that he comes to realize that his imaginary sibling had a real predecessor: a half brother whose death in the concentration camps is part of a buried family secret that he was intended never to uncover. --from Publisher description.