Julien Boissel wishes to marry Yvonne. Her father Victor is blackmailed by newspaper manager Gauthier who threatens to release compromising papers from when Victor was a minister if he does not get Yvonne's hand in marriage. Victor asks Julien to stop courting Yvonne and the young man accepts an invitation from his cousin Jacqueline to drown his sorrow at the Moulin Rouge where he meets a strange doctor who offers to hypnotize his troubles away. A young reporter working for Gauthier investigating the strange things lately happening in Paris finds the mysterious doctor.