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. When Maddy finally unlocks fragments of the secret that Becks has been holding on to, the Time Riders start to piece together their true purpose. Racing through time to connect the clues, the team discover a Mayan tribe and an ancient relic provides a vital link to the past and future. But not all the Time Riders can cope with the discovery and one threatens to bring them all down if they can act out their revenge.