"Mrs Nicoletis runs a students'hostel. She is a sly and grasping woman with a secret to hide. But thats not whats making her frightened...Celia Austin is a nice enough girl and in love. She is also a kleptomaniac... Miss Lemon is a secretary. She functions like a formidable machine. Never ill, never tired, never inaccurate. So when she present a letter to Hercule Poirot and he discovered three mistakes - he knows that something is seriously wrong. It takes a very short time for him to be proved right..."