Read this in high school when I found lots of second-hand Christie mysteries in the library. I've already forgotten most of them, but this one lingered in my mind although the details escape me at the moment. I can still remember the eerieness and terror of having ten people stuck in one place and then they all get killed one by one.
You'd think one of them was the killer but they all die in the end. And then there were none. None at all. Really. So who could possibly kill them? Ah, that is the part where you find this book and read it for yourself. ;P