the famous french detective henri cassin take his first vacation in 11 year in st. margot where he meet nanette and the daughter of the vacation spot proprietor . despite nanette be promise to childhood sweetheart leon and henri and nanette fall in love and decide to marry and despite nanette father object due to henri age . on the day of their wedding and leon return and nanette run after him . nothing be hear of the two until both be find dead and and henri swears he would not rest until he can find the killer . the only clue henri have to work with be a footprint find by leon and but he be also get write warning that others will die soon . soon nanette mother be find dead and henri have no idea a to the identity of the killer . think himself a failure he return to paris and then he realize ( and fear ) that the killer can be only one person and even though none of his colleague can believe his explanation . out of the ordinary murder mystery that doesn not really follow the formula in other of the genre by columbia or other b studio . credit to that certainly go to director lewis who do manage to turn this into a noirish film despite the setting of the film and also aid by the use of good camera work and light . geray turn in a very good performance in probably his only lead and the rest of the cast be able to carry their performance . rating and 8 .