Someone (perhaps Margery Allingham) once said that Dorothy Sayers fatal mistake was that she fell in love with her detective. There is a great deal of truth in that, towards the last novels he becomes so perfect that he is a bit of a bore - though his PTSD saves him a bit of humanity.
For anybody who wants more about Peter Whimsey: Jill Paton Walsh wrote three more books about Peter and Harriet Whimsey. They are quite good, pretty much in the style of Dorothy Sayers and worth reading. In addition, there are "The Wimsey Papers" by Dorothy Sayers, published in 1939-1940, containing supposed letters from various members of the Whimsey family (Jill Paton based some of her sequels on them). They were published in a magazine, and then collected. Thanks, @taliavishay-arbel for sharing! I didn't know. I'm not a huge fan, but I like Peter Whimsey.
The same as in the series multipled Greatly but there again I have only read 2
Ajisai, one of Mary Stewart's books, The Moonspinners, was filmed decades ago, starring Hayley Mills. You might want to watch it. I'm a great fan of hers.
Chandler is an excellent stylist, and I have read my favorites (The Big Sleep, The High Window, The Little Sister) multiple times.