Max and Maddy Twist have a flair for solving crimes. Their parents once ran a thriving detective agency—until the notorious Professor Claude Sardine shut them down. But now Max and Maddy are ready to pick up where their parents left off. When a Swiss businessman asks for their help in catching a bank robber, Max and Maddy can’t wait to take on the case. But little do they expect to find themselves hot on the trail of a gang of thieving St. Bernards!