Lord Peter Wimsey returns from an extended visit to Corsica to find his family's name all over the police reports: his sister Mary's fiance has been found shot dead, and their brother Gerald, the Duke of Denver, has been arrested for the murder. Lord Peter and Inspector Parker attempt to find the real killer, or at least to clear Gerald, but they find the problem with the case is too many clues.
I have read this book as well, but what I really want to talk about is the BBC production with Ian Carmichael as Lord Peter. Mark Eden played Parker, Rachel Herbert was Mary, and Glyn Houston played Lord Peter's indispensible manservant Bunter with wonderful aplomb. It has the look of 1970s BBC drama, filmed mostly on unconvincing sets but wonderfully acted, especially by Carmichael and Houston. One of the extra features on the DVD is an interview with Ian Carmichael, in which he disarmingly admits up front that he was always a good 20 years too old for the role. Indeed he was, but he certainly had the attitude right!