Journalist Lucy Lyutikova's friend is going abroad for a week. And who will look after her four children? Well, of course, the reliable “Aunt Lucy”! If only the naive fat girl knew what she was getting herself into... First of all, all of Lucy's money is stolen, and in order to feed her children, she gets involved in a strange adventure. The sad result is a murder in which Lucy's former classmate is suspected. Lyutikova is sure that the real killer is walking free and only she can find him!