When a famous millionaire asks young detectives Max and Maddy Twist to investigate who is sabotaging an international balloon race for charity, they find themselves competing against world-renowned balloonists--and one old nemesis. Reprint.

The Deceivers

Features international detectives Max and Maddy Twist, who made their mark with The Chocolate Money Mystery.

Asked by a Swiss banker to investigate a series of bank robberies committed by dogs, young detectives Max and Maddy Twist travel to Switzerland, where they discover that the man behind the robberies is none other than Professor Sardine. Reprint.

On a trip to the snake park with his Uncle Peter, Akimbo has an adventure involving a deadly green mamba snake.

Akimbo goes to the rescue of a zoologist who is injured on his father's game preserve.

Harriet helps her detective aunts, Thessalonika and Japonica, investigate cheating at the racetrack by disguising herself as a jockey. Reprint.