TimeRiders Book 2: Day of the Predator

While Liam and Becks are on a mission to save Edward Chan from an assassin on a school field trip to a zero point energy reactor a time window is accidentally opened to the sixty-five million years ago in the hunting ground of a deadly undiscovered species of predator, and in the process Liam, Becks and a group of college students are sucked in and are trapped there. In an attempt to survive they build a camp and attempt to send messages into the present time, while Maddy and Sal, with the help of the computer Bob try to find them and rescue them.