Timecracks act as portals to other dimensions. They have existed since the creation of time and multiverse, and when one arrives during a storm at the newly discovered pyramid site in the Yucatan jungle, it's the beginning of a nightmare journey into another world for archaeologist, Malcolm Kinross and his wife, Lucy.When another timecrack strikes the secretive energy complex, the Facility in New Mexico, their sons, Archie and Richard, along with their tutor, Marjorie, and uncle, Professor John Strawbridge, find themselves thrust into the same world of New Arrivals, ancient warring tribes and deadly enemies.Richard is endowed with the ability to 'see' beyond his own world. Can he help Archie to find their parents, and find a way to escape the rebel Arnaks and return to their own world?