Death in Paradise: An Unholy Death

A young nun is found dead in a smoke-filled bedroom in what seems like a terrible accident caused by a lit cigarette. But when Richard deduces it must have been murder, there are no shortage of suspects, including other nuns, a priest and the mother superior - as well as an unscrupulous PR man promoting a holy spring in the convent grounds. The question is, with the room locked from the inside, how could anyone have committed the crime in the first place? Kenneth Cranham, Patrick Baladi and Caroline Langrishe guest star