The Perfect Murder
7.35pm, Channel 4
Is there such a thing as a perfect murder? It would seem not. This documentary looks at how one such secret finally came back on the perpetrators years after they had "got away" with it. In the early 90s, Colin Howe and Hazel Stewart had an affair, but their small Irish community was rocked when their spouses were found dead in what seemed to be a suicide pact. But almost 20 years later Howe confessed to murdering them, with Stewart's assistance. Both are now imprisoned, but Stewart has remarried in the interim and her family are protesting her innocence and picking up the pieces. Phelim O'Neill
India On Four Wheels
Presenters Anita Rani and Justin Rowlatt explore the motoring culture of India – by driving around it.