The body of a dead girl is found in the library of an older couple. There are only two people with motives, and the case gets more and more complicated until Miss Marple is called for help by the police to solve the crime.

I can never guess the killer's identity in a Christie novel! Ever! Just when I think I've got it, I realize she's dropped too many red herrings, making me think I've figured it out, but it's just a ruse, so I guess another character but get stumped, trying to figure out their motive, and then I doubt myself again, and we're back to square one. I shake my fist at Agatha Christie and scream, 'Curse you!,' but I mean it in the best possible way.