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When a diphtheria epidemic hits her 1840 village, thirteen-year-old Jessie discovers it is actually a 1995 tourist site under unseen observation by heartless scientists, and it's up to Jessie to escape the village and save the lives of the dying children.

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 hungry cat, endangered penguins, a fish-stealing monster, and a dirty election.

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.

Fifth graders Drake Doyle and Nell Fossey use their detective and scientific investigation skills to solve cases which involve food poisoning, missing terns, a haunted treehouse, and a pig in a pit.

As the founders of the Chicagoland Detective Agency, a haiku-writing girl and a boy with a talking dog have more than enough cases on their hands (and paws) when a friend vanishes, a mummy's amulet disappears, and an evil scientist stalks human brains and hearts.

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.

Now in fifth grade, Drake Doyle and Nell Fossey continue to combine their detective and scientific investigation skills to solve a variety of cases, involving a noisy laundry chute, a ruined flower show, and a ghost.

Josephine, the new girl in Awkward Falls, and her neighbor Thaddeus, a reclusive, orphaned boy inventor, are targets of a mad cannibal from the local criminal asylum.

Twelve-year-old Maggie receives European fire bugs for her birthday, but when they fail to metamorphose and grow grossly large and explode instead, she uses scientific reasoning to determine the cause of their strange deaths.

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.

After studying animal adaptations and then noticing a camp counselor's suspicious late-night activities, campers begin to fear that the counselor is really a werewolf.

When Jordan finds a fossilized log with a map inside, the campers of Camp Dakota set out in search of treasure, but since erosion and weathering have changed the landscape they must use their knowledge of geology to follow the landmarks on the map.

After studying animal adaptations and then noticing a camp counselor's suspicious late-night activities, campers begin to fear that the counselor is really a werewolf.

Presents sixty five mystery scenarios and brain-teasers for young students to solve using science and critical thinking skills.