Sixth Grade

• Earth Science
• Life Science
• Story / Adventure

Why it works: Bear Bottom brings Teddy Fitzroy to a bison ranch near Yellowstone where endangered bison vanish and a grizzly's break-in complicates a necklace mystery. Bison conservation, bear behavior, scat evidence, and Yellowstone's geothermal hazards supply clues and risks that Teddy must interpret correctly.

• Astronomy & Space
• Engineering & Technology
• Story / Adventure

Why it works: The disappearance of Moon Base Alpha's commander becomes harder precisely because the first lunar settlement is tiny, enclosed, and surrounded by an unsurvivable exterior. Dash's search uses the constraints of a closed habitat as evidence, while telepathy and alien contact stay openly speculative.

• Earth Science
• Life Science
• Story / Adventure

Why it works: Tyrannosaurus Wrecks gives Teddy Fitzroy two linked mysteries: a five-hundred-pound tyrannosaur skull vanishes from an active dig, and illegally traded reptiles lead toward ecological harm. Paleontologists, excavation practice, fossil ownership, anaconda biology, and animal trafficking supply the real-world systems behind the clues and suspects.

• Life Science
• Environment & Ecology
• Story / Adventure

Why it works: Big Game makes a pregnant, endangered greater one-horned rhinoceros the target at the center of Teddy Fitzroy's zoo mystery. Rhino biology, the value placed on horn, poaching pressure, and protective management explain both the stakes and the suspects' possible motives.

• Life Science
• Environment & Ecology
• Maker / Problem-Solving

Why it works: Teddy's mystery begins when a mountain lion is blamed for a dog's death and a public campaign demands that the cat be hunted. Solving the case requires separating accusation from animal evidence, placing wildlife behavior and management inside the suspense and comedy.

• Earth Science
• Life Science
• Maker / Problem-Solving

Why it works: A dead whale that explodes before its cause of death is known and a second case involving tons of stolen sand pull Teddy and a veterinarian into a Malibu investigation. The linked mysteries make marine evidence, water samples, whale protection, and sand as a finite material necessary to identify wrongdoing.

• Life Science
• Environment & Ecology
• Story / Adventure

Why it works: All Ears gives Teddy Fitzroy two linked investigations: finding a missing African elephant and clearing a friend accused of damaging equipment at a wind-farm site that would replace wildlife habitat. Elephant behavior, human-wildlife conflict, habitat loss, and the tradeoff between renewable energy and local conservation repeatedly determine which clues and motives make sense.

• Life Science
• Maker / Problem-Solving

Why it works: Poached puts Teddy Fitzroy inside a comic FunJungle mystery involving a missing koala and a zoo full of possible clues. The investigation repeatedly asks readers to use animal facts and behavior to test human stories, so zoology participates in solving the whodunit.

• Life Science
• Environment & Ecology
• Maker / Problem-Solving

Why it works: Panda-Monium makes Teddy Fitzroy solve the disappearance of FunJungle's rare new giant panda, Li Ping, while zoo-animal behavior keeps producing clues and complications. The mystery's comic action depends on distinguishing natural and learned behavior and on understanding why a panda's care, ownership, and transport are unusually constrained.

• Astronomy & Space
• Engineering & Technology
• Story / Adventure

Why it works: A scientist's death outside Moon Base Alpha becomes a locked-environment mystery because every resident depends on helmets, habitat rules, and limited access to the lunar surface. Dash must test an apparently simple equipment explanation inside a speculative colony where real lunar constraints create the clues.

• Life Science
• Environment & Ecology
• Story / Adventure

Why it works: Belly Up begins when Teddy Fitzroy doubts the official claim that FunJungle's hippopotamus died naturally. Evaluating the animal's condition, behavior, care, and possible causes of death turns zoo biology and evidence testing into the machinery of a murder mystery.

• Life Science
• Environment & Ecology
• Story / Adventure

Why it works: Ape Escape sends Teddy Fitzroy across Rwanda, the Serengeti, and Zanzibar to rescue a stolen baby gorilla from a wildlife-trafficking network. Gorilla needs, African habitats, poaching, and field clues set the route and urgency, making conservation science inseparable from the international chase.

• Earth Science
• Life Science
• Mystery / Investigation

Why it works: A Dinosaur for Washington follows the real discovery of Washington State's only known dinosaur fossil and the work required to identify it. The mystery of what was found on Sucia Island turns fossil comparison, uncertainty, and scientific verification into the plot of the true story.

• Life Science
• Biography / Memoir

Why it works: Maria Merian's persistence as an artist and observer turns the butterfly life cycle into the unfolding achievement of a real person. Her paintings let readers see how close study of caterpillars, host plants, chrysalises, and adults helped change what people understood about metamorphosis.