The book has always been a powerful weapon and medium for communicating with other people as well as themselvs. Book can shape a childs way of thinking and influence behavior, and can often help solve major or minor problems that children face. They also open up space for interpretation, reflection and dialogue and have a distinctively educational and developmental role. By understanding and analyzing the situation of the child, by stimulating discussion, thinking through and evaluating possible solutions, books can have a therapeutic effect on children. The power of the book, which has long recognized as a therapeutic tool to advise, assist and heal, is in fact the foundation upon which the concept of bibliotherapy rest. The theme of this paper is the role of the problem picture book in developmental bibliotherapy, drawing on the power of the problem picture book on a child facing a particular problem. This paper explains the concept of bibliotherapy in general as well as the development of bibliotherapy in Croatia; types and methods of pediatric bibliotherapy, with an emphasis on the therapeutic picture book and its role in developmental bibliography, which is the most common but also the most appropriate for conducting it. The paper also presents a survey conducted among educators on the island of Pag, which shows the use of a problem picture book and how familiar they are with the term bibliotherapy and its method and application through direct work. The final part of the work through a case study presents my experience of acting in which two children were treated, and how reading therapeutic therapies influenced children's problem solving.