The Extended Day Group is an exciting book about young people who are forced to stay at school after school due to an emergency outside the gates. The main characters are six high school students who begin to understand each other only when they have to face danger together. Each of them has their own secrets, but it is the common struggle for survival that forces them to become a single team. This book is full of tension, friendship, discovery and inevitable changes in the lives of the characters. "Group of an extended day" is an exciting journey into the world of teenage feelings and relationships, which will leave an unforgettable mark in the hearts of readers.