Born into a well-off family, Hélène has become a devoted and passionate social worker. Touched by the lot of Christine, a young girl in distress, she persuades her father to take her at his home. But things soon go wrong and Christine gets kicked out for a fault she has not committed. Too bad because Hélène, left to fend for herself, falls under the influence of a shady individual, Monsieur Roger. Now the man happens to be a pimp and what he is after is to force Hélène into prostitution...