Young P. C. Hawke and his buddy Mackenzie search for the real killer of the Museum of Natural History's chief biologist after their friend, a custodian named Tom, is falsely accused.
New York teenager P. C. Hawke and his buddy Mackenzie suspect insurance fraud when the mother of a recently departed classmate suddenly starts living a very extravagant lifestyle.
P.C. and Mac decide to investigate when they notice a bizarre connection between the seemingly accidental deaths of a number of famous chefs in New York City.
Zack and his Native American friend Uta embark on a dangerous investigation when they find a dinosaur egg that hatches into a baby raptor, and set out to explore the mine shafts and tunnels of Silver Mountain in search of the raptor herd.
When fifteen-year-old Jackson visits his aunt in England, he becomes caught up in a chase to capture an unknown creature who is stalking and killing people on the plains surrounding ancient Stonehenge.
In 1945, having joined his father at Los Alamos, where he and other scientists are working on a secret project to end World War II, thirteen-year-old Stephen becomes caught in a web of secrecy and intrigue.
