Mario (Leonard Sachs) runs a bar and sells art on the side for a hefty commission.
One day in comes a man (Peter Howell) who has been living with the monks and has some painting to sell. He does not even haggle when Mario wants 40% as commission.
Mario agrees and drops it to 30%. The man does not leave his address but tells Mario he will come down in a week's time.
The man looks familiar to Mario who was in the resistance in the war against Mussolini. Mario's war record counts for something and the local police agrees to get someone to surreptitiously photograph this man the next time he pops down.
When he is photographed as Marion gives the man the proceeds for the sale of a painting. The photo is circulated and attracts the attention of Interpol.
The man is called Turner and he acted for the Nazis during the war. He is the son of a distinguished man and was thought to be dead.
Interpol Agent Smith goes to Italy and travels to the monastery to go looking for him.
This story took an age to get going and there was not much to it. I have no idea why Turner wanted the money or how he managed to get to the village with all his paintings. It took Smith several days with guides to get to the monastery.