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Eddie Constantine makes his second appearance as Peter Cheyney's hard-boiled FBI agent Lemmy Caution in Cet Homme est Dangereux. Curiously, when first we meet Lemmy, he is a crook on the lam. Actually, our hero is working undercover to entrap a French bank robber. Along the way, he becomes a reluctant kidnapper, snatching dizzy American heiress Constance (Collette Doreal). As things turn out, it is Constance who holds Lemmy prisoner at fade-out time--not that he's complaining about it. Based on Peter Cheyney's novel The Gun Moll Poison Ivy, Cet Homme est Dangereux was simultenously filmed in an English-language version.