Which episode that had a son having an affair with his step-mother?

~ I was just wondering if anyone remembered that episode? It was a great one that I enjoyed so much. I remember seeing it months ago on PBS. This is the episode that Father Brown must solve the murder of a woman that wasn't too old. She was having an affair with her older husband's son. Sadly I didn't remember the name of that episode or the season. Do any of you remember that one?


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"Ask me if I need him
Get him out of my way
These are
These are the games
These are the games
These are the only games I play"

By: Falsettos