Father Brown tries to transport a historically important cross to Rome engaging in battles of wits and faith with a thief and pursuing policeman. The thief, named Flambeau (Finch), is a master of disguise and is elusive, as Father Brown pursues him and tries to convince him to abandon his criminal career. During the making of the film, Alec Guinness was mistaken by a small boy for an actual priest. This episode appears to have played a part in Guinness's later conversion to Roman Catholicism.
演员：马里奥·卡萨斯 阿尔维托·圣胡安 阿谢尔·埃特塞安迪亚 诺拉·埃尔南德斯 奥斯卡·拉萨特 马丁·派斯 埃尔薇拉·明戈斯 Toni Agustí 费兰·加德亚 Eleazar Ortiz Carlos Serrano 卡门·巴拉格 Eva Ugarte Xavi Francés Gloria March 安东尼奥·雷西内斯 Abdel Senouci Rafael Valls Sergio Caballero Vicent Domingo