Ruth Rendell's short fiction is every bit as good as her novel-length work, and there are several superb examples in this collection, previously published in three separate volumes.
Means of Evil is a collection of Inspector Wexford stories, while the other two sets feature Rendell's darker and more fascinating suspense pieces. The award winning story "The Fallen Curtain" is one of her most powerful and effective pieces. "A Case of Coincidence", "The Double", and "You Can't Be too Careful" are other standouts, but these are all great stories.
If you haven't read Rendell before, this is an excellent introduction to her work. And if you're already a Rendell fan, you probably have these stories already. These are tales to be read and reread and enjoyed endlessly.