This is the 5th book in a wonderful series that I would classify as a complicated cozy with an interesting twist...the author has written himself in as one of the characters. This one had Agatha Christie vibes and a locked room scenario. It also had a cast of other interesting characters who were all viable suspects. I really enjoyed it and look forward to more from this author. Thank you to HarperCollins and Edelweiss+ for the digital ARC. 4/5