I really enjoy Lord Peter, particularly his relationship with Harriet. I also enjoy complicated mysteries that are difficult to work out. One of Sayers' worst habits is to have Lord Peter have an idea, communicate it to someone (or no-one, on occasion) and not tell the reader. It drives me nuts because I like to have all the clues in front of me. Still, I don't think I could have solved this one myself - all those (view spoiler)[changing identities - on top of which I started by confusing Perkins and Bright. My husband complains about these sorts of books that he can't keep all the characters straight. It's not a problem I usually have but with each character playing multiple characters I was confused half the time and had to keep going back to check the details (hide spoiler)]. I knew there was something wrong with (view spoiler)[the blood, based both on how strong a point was made of the evidence and the fact that my chosen murderer (Weldon, of course) didn't believe it. I did not connect it to the haemophilia, but of course I didn't know all the symptoms, which I found very interesting. I will have to look into it some more (hide spoiler)].