I have to say that I have very little sympathy for Cathcart. This was a very convoluted mystery. Peter Wimsey investigates the death of his sister's fiancé when the police blame his brother, aided by his friend Parker. Saying more than that would spoil things.
It started it off pretty slow. I have to say that Sayers inquest and courtroom scenes aren't very riveting. Things pick up when Peter's mother comes onto the scene, and the scenes with banter and so on are fun.
I read this for the "Country House Mystery" square for the Halloween Bingo, making this my last official Bingo read. It fits the square quite nicely since the death takes place in the country and there's a limited pool of suspects. It's interesting that most of the salient events take place on the 14th of October, the same day I started to read the book (well, yes, some stuff happens before midnight on the 13th, but still).
Previous updates: