Un tableau est volé par effraction dans une galerie et le journaliste Roland Gauthier enquête. Il découvre que le vol cache une vaste organisation ...
Two painting are stolen ,in an art gallery and in a painter's house.The burglars always leave the picture of a royal seal after their theft.The local captain in charge of the investigation is not very smart ,but fortunately private detective Roland Gautier takes the affair in hand : it must be a gang .He suspects the shady owner of a nightclub .Gautier is kidnapped and held prisoner on a barge.To get rid of him, the criminals want to drown him.The boss's mistress,Irmène ,remembers that the young man saved her little brother's life and decides to help him.
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