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 2026.

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 Julian Lewis finds his name in a coded manuscript that is almost one thousand years old. How did Julian's name get in there . . . and why?

Confronted by Julian 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 . . .