Detective. There is a murder on a spaceship. Everyone, both passengers and crew, are dead, except the cat. It turns out that the ship was transporting diamonds mined from the rings of Saturn. This time among the ordinary stones there was a 349-carat diamond. Upon inspection of the scene, it turns out that all the diamonds are intact and are in the safe. It is unclear what the criminal wanted. Student trainee Raisa managed to “talk” the cat and find out what happened on the ship.