The plot focuses on the experiences lived by eight people; they are in a guest house, unable to go out because of the snow. The news reports a crime committed in London, of which they are all suspected of having committed. The day this guesthouse is inaugurated, the young couple that runs it receives five visitors, one of whom arrives unexpectedly. The next day, a detective appears to inform them that the murderer of a woman in London had gone to Monkwell Manor, the name of the house where they are staying. This person has left as clues the address of the house, and a song that mentions three blind mice. Perhaps he implies that whoever has murdered the woman intends to commit two more crimes and that the next target is there. The weather conditions are still bad and everyone has to stay there. Indeed, in that time a second murder takes place; they are all suspects; the event generates discord among them and a climate of distrust. The detective convinces them to follow a plan that will expose the murderer.