Amalia's family is ruined! Now, if she got married successfully... The girl had no doubt that she would be successful in the world, and was preparing with all her might for the Lanins’ ball. But she never managed to shine: the ball was canceled due to tragic circumstances. Julie Lanina died. At her parents' house, Amalia met an official of the police department, the sweet, clumsy Sasha Zyablikov. In great secrecy, he said that several rich noble girls had already died without any reason. Amalia became interested in his investigation, and strange things began to happen to her: first she was almost hit by a carriage, then a kitten died after drinking milk from her cup...