Children's literature is over three hundred years old, which means that its beginnings started in the 17th century. It covers works written for children and it is read by children. There are several types of children's literature, such as: picture books, plays, childhood poetry, short stories about childhood, stories and novels. These literary works are mainly written for children because adults do not read them, only in exceptional situations. There are also so called border types, which are read both by children and adults. Border types include comics, fables, animal stories, novels, travel books, biographies, historical novels and science- fiction. One of the most important type of children's literature is a children's novel or novel about childhood. Children are the main characters. This type of a novel is written in a simple and comprehensible language with a simple characterization of characters. A children's criminal novel has an important role in children's literature because of its tense and often dangerous incidents and is also filled with reasearch, dynamics and action. In this paper three criminological novels are presented: "The Spirit in the Swamp", "The Hut in the Mountains" and "The Secret of the Fishy Eye".