The Secret Seven story features a group of seven children as the main characters. Peter, the more or less unofficial leader, is brave and smart. Janet, his sister, is equally intelligent and often has great ideas. Jack is a reliable friend. Barbara and Pam add a female perspective to the group's activities. Colin is quite observant, which helps in their investigations. And George is the one who isn't afraid to take risks. Together, they make up the Secret Seven and are the heart of all the exciting stories in the book.
The main characters are the seven kids in the Secret Seven. Peter is often a leader in their adventures. Janet is his sister and also very involved. Jack is another important member. Barbara, Pam, Colin, and George each bring their own personalities and skills to the group. For instance, Colin might be good at noticing small details, while George is brave when they face challenges during their mystery - solving quests.