Go Ahead Secret Seven

This is a mystery-adventure book where the Secret Seven, a group of friends, investigate a spooky house in their neighborhood. In doing so, they uncover a mystery and must use their cunning, bravery and teamwork to solve it. When a sinister-looking man gets George in trouble with the police, the Secret Seven are outraged! Spying on him, the gang are certain he's bad news, but what exactly is he up to? They need to investigate, and solve the mystery, once and for all.