A young woman in a lesbian relationship keeps a diary that is stolen by a young man who loves her.

Jacques, a young reporter, is in charge of covering the International Youth Meeting in Warsaw. He falls in love with a young participant, Mireille, who returns his love. The joy of the lovebirds is on a par with the general glee. But during a walk, they discover the ruins of the ghetto where so many victims of Nazism died. On a more intimate level, a serious problem of conscience arises for Jacques.