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.
When mutant rats threaten to take over Staten Island, which has become a huge landfill, fourteen-year-old Sarah and her younger brother Mike try to figure out how to stop them.
Fifteen-year-old Loch and his younger sister join their father on a scientific expedition searching for enormous prehistoric creatures sighted in a Vermont lake, but it soon becomes obvious that the expedition's leaders aren't interested in preserving the creatures.
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.