I'm currently reading The Mysterious Affair at Styles by Agatha Christie. It's my third Poirot novel after Murder on the Orient Express and Murder on the River Nile. I think it will be my last.
They're fun books and well-written, but also very much alike. And that Poirot guy is getting on my nerves...
After this I have Rebecca by Daphne du Maurier waiting for me. I read it when I was a teenager when I found a copy from the forties lying around and even though it was a little too hard for me, I remember liking it. I'm curious to see how I'll like it now.