The story is set in a small village in rural France. It's about a gang of friends who play together every day. The character I most remember is the Dog Girl, because at the end of the book when they are fighting the villains she defeats them by calling all the dogs in the town with her special whistle. She and her pack of dogs take the thieves to the police.
The hundred million francs of the title refers to the amount of money the baddies had taken from a Paris bank.
I found this book had some extremely interesting and at times rather funny parts so I have decided to give it 75 out of 100