Liam O'Connor should have died at sea in 1912. Maddy Carter should have died on a plane in 2010. Sal Vikram should have died in a fire in 2029.

Yet moments before death, someone mysteriously appeared and said, 'Take my hand . . .'But all three have been given a second chance - to work for an agency that no one knows exists.

Its purpose: to prevent time travel destroying history . . .

In 1993 British computer hacker Adam Lewis finds his name in a coded manuscript that is almost one thousand years old. How did Adam's name get in there . .

. and why? Confronted by Adam in 2001, the TimeRiders travel back to Sherwood Forest in 1193 to discover the origins of the ancient message. But when a strange hooded man appears interested in the same thing, they begin to wonder what terrible threat this cryptic link from the past holds for the future .