Tiger in the Sky

In this action-packed science fiction adventure, teens from across time must save a scientific base from a destructive—yet adorable—threat.

Twenty-fourth-century Earth is a utopia, but when crisis arises aboard a space station on the edge of the solar system, the adults are powerless to help. The teens of this era are amazingly intelligent but they lack the necessary grit for the challenge. Their only option is to turn to Operation Hourglass . . .

For five years, Operation Hourglass has yanke...