TimeRiders: The Doomsday Code (Book 3)

The Doomsday Code: the third book in Alex Scarrow''s exciting TimeRiders series
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 . . .
The TimeRiders series:
TimeRiders; Day of the Predator; The Doomsday Code; The Eternal War; Gates of Rome; City of Shadows; The Pirate Kings
Alex''s thrillers for adults:
A Thousand Suns; Last Light; october Skies; Afterlight; The Candle Man