Reading progress update: I've read 37%.

The Hound of Death - Agatha Christie

If anyone is already collecting ideas for next year's Halloween bingo / spooky season, The Hound of Death would make an excellent option to explore Dame Agatha's darker short stories. 

They are not really featuring murder and mystery so much as supernatural elements and dark atmospheric stories. Well, some contain a murder mystery...it's Agatha Christie after all.