Henry Carter Hull

Fifth-grade sleuths and science experts Drake and Nell solve four challenging cases involving a werewolf at a campsite, a faked tyrannosaurus rex skeleton, a talking oven, and a polluted stream full of dead fish.

Ruth Rose, Josh, and Dink attend a concert during which someone steals the star's diamond pendant, and they are soon on the trail of the thief.

The Thea sisters learn about a mysterious shipwreck off Whale Island from their history professor, who disappears, prompting the sisters to search for him and the legendary treasure they think he was searching for before he disappeared.

Fourth-graders Drake Doyle and Nell Fossey combine their detective and scientific investigation skills to solve cases involving a crooked carnival barker, a mysterious ghost, an alien plant species invading wildlife habitats, and a wobbly bridge.

Fourth-graders Drake Doyle and Nell Fossey combine their detective and scientific investigation skills to solve a variety of cases, involving a noisy garbage can, endangered frogs, a stuck truck, and a mysterious love letter.

While learning detective skills at a sleep-away camp, Dink and his friends undercover a real mystery involving stolen paintings.

Thea's friends the Thea Sisters travel to India where they investigate when the monkeys living in the city start stealing jewels.

The Thea Sisters travel to Alaska for a conference held by an ecological association, and discover that the ice is being destroyed with explosives.

Dink, Josh, and Ruth Rose help catch the thieves who have stolen the treasure from the museum's mummy exhibit.

The Alden family rents a houseboat to drift down the river, and encounters a mystery in the little towns along the river, involving a fast black car.