Jonathan Creek: Season 5, Episode 1

5 - 1: The Letters of Septimus Noone

When a classic locked-room novel is turned into a West End musical, one of its stars falls victim to a real-life 'impossible crime'. No weapon or any other evidence of an intruder can be found, nor any rational explanation for the victim's wounds. As the actress's life hangs in the balance, her producer and colleagues remain baffled. Attention once again turns to the lateral-thinking Jonathan Creek for a solution to the whole grisly puzzle. But can Creek - now a happily married man - even be persuaded to embark upon the investigation? As he and wife Polly struggle to come to terms with a sudden personal tragedy, a series of dark and disturbing family secrets are about to emerge that will throw the couple's whole world into turmoil...