Laurels are poison - Gladys MITCHELL
Gladys Mitchell wrote a huge number of mysteries while continuing her day job as a teacher. Some have a melodramatic ending that makes me cringe, just a little, but she's a great mystery writer in the British tradition. Also, she's one of the few who occasionally dares to defend and absolve the murderer--and although in the one book I've read where Agatha Christie tried this I was not impressed, Mitchell pulls it off. That's not to say that defending the murderer is what Laurels are Poison does. No, I'm not saying. To find the murderer you have to read the book. And if you haven't "met" crocodilian Mrs Bradley, you're in for a treat.