It's one of the few Christies I haven't read, because I chanced upon a spoiler and didn't want to read a "spoiled" book.

If you're new to Christie, you might find the plotting of Towards Zero interesting (there is a TV adaptation, but I haven't seen it and would recommend avoiding it until you've read the novel).

Towards Zero ends with the crime rather than beginning with it, but you still have to figure out who the criminal is. Like Acroyd, it’s a tour de force of point of view. You read the thoughts of the perpetrator as he/she prepares the crime, but you don’t know which character is the perpetrator until the very end.