InthetimeofCounter-Reformation,amillerandhissoncomeunderinvestigationbyapriestoftheInquisition,whenrumorsspreadthattheirprosperitycomesfromworkingwiththeDevil.TheDevil'sTrapisafilmdirectedbyFrantišekVlá?il,basedonanovelbyAlfrédTechnik,adaptedbyFrantišekA.DvorákandMilošKratochvíl.ItwasthefirstofthreehistoricaldramasthatVlá?ilmadeduringtheCzechNewWave(technicallyheisn'treallyapartoftheNewWave,howeverthesefilmsweremadeduringthesameeraofartisticfreedom),precedinghismorewellknownMarketaLazaro