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.

Max and Maddy and the Chocolate Money Mystery

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.

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.

When she joins Aunt Japonica and Aunt Thessalonika on a trip to America, nine-year-old Harriet meets yet another relative--Aunt Formica, a cowgirl who is having trouble with some clever and mysterious cattle rustlers.

When her absent-minded inventor father suddenly remembers that he has five sisters, nine-year-old Harriet Bean, who has never heard of them before, determines to find her unknown aunts so that the unfinished family portrait can be completed. Reprint.

When Akimbo and his park ranger father unintentionally capture a lion cub near an African game park when they are trying to trap a lion that has been attacking cattle on nearby farms, Akimbo wants to keep the cub. Reprint.

In three separate scrumptious stories, children help adults solve problems related to food, first by saving a restaurant from being shut down, second by untangling a mess in a spaghetti factory, and finally by selling donuts to raise funds for a stolen car. Simultaneous. 45,000 first printing.