Taking an abandoned road, two teenagers are transported back in time to Avalon of Arthurian legend where they are embroiled in a battle between g

A group of space agents runs into opposition while attempting to carry out its mission of colonizing a planet.

Four boys of Scandinavian, Welsh, Chinese, and African origin, respectively, find a puzzle in an abandoned house whose magic power takes each of

Ross Murdock, Gordon Ashe, and other members of the Terran settlement team travel back in time to investigate a civilization that once flourished

In an effort to discover the source of the alien technology the Russians are using, Ross Murdock travels back in time to Britain in the year 2000