TimeRiders: The Infinity Cage (book 9)

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 . . .

The end is approaching for the TimeRiders. In a final effort to prevent time travel destroying history, Liam and Maddy jump forward to 2070 to confront the enigmatic Waldstein and prove once and for all if he is friend or foe. What they discover is more shocking than anyone could have imagined and soon the TimeRiders are on one final mission - back to Biblical times to save the whole of humanity...