"Testimony of Ola N." - is an exciting book by a famous Ukrainian writer, which tells about the life and adventures of a young girl named Olya. The main character accidentally witnesses a crime and gets into a dangerous situation where she has to hide the truth from dangerous people. Together with Olya, readers will learn how she will face challenges, obstacles and difficulties, try to uncover the truth and protect herself from criminals. This book is full of suspense, mysteries and unexpected turns of events that keep the reader in suspense until the last page. "Testimony of Ola N." - this is an exciting detective story that will definitely interest all lovers of books about mysterious adventures.