One class of school children from a small village make the trip to Zagreb. One of the boys gets sick and the class is forced to go home. During their journey the train gets stuck in a snowstorm.
Robert is a SF writer, who realizes that he can make his thoughts material. Because of that, a group of aliens arrives to Earth. Their leader is Andra, who shows affection for Robert, which does not please his girlfriend, Biba. A monster, Mumu, has arrived together with the visitors from space.
Musicologist and professor Kosor wakes up in a hospital. He has survived a serious car accident. In a bed next to his lies the amiable economist Gajski, whose wife Melita regularly visits him. This unusually beautiful woman is the first person that Kosor sees after he gains consciousness and is completely enchanted by her. Kosor becomes obsessed by Melita’s physical beauty and her trustworthy character and begins a risky game of writing and sending her anonymous love letters…
