FatherBrowntriestotransportahistoricallyimportantcrosstoRomeengaginginbattlesofwitsandfaithwithathiefandpursuingpoliceman.Thethief,namedFlambeau(Finch),isamasterofdisguiseandiselusive,asFatherBrownpursueshimandtriestoconvincehimtoabandonhiscriminalcareer. Duringthemakingofthefilm,AlecGuinnesswasmistakenbyasmallboyforanactualpriest.ThisepisodeappearstohaveplayedapartinGuinness'slaterconversiontoRomanCatholicism.
