Day of the predator / Scarrow, Alex

Teens Maddy, Liam, and Sal are sent on their first solo assignment for a secret agency and must prevent the murder of the father of time travel, but when Liam is accidentally marooned in the late Cretaceous period, he discovers his biggest threat is worse than the legendary tyrannosaur.

When Maddy mistakenly opens a time window where and when she shouldn't have, Liam is marooned sixty-five million years in the past in the hunting ground of a deadly--and until now--undiscovered species of predator. Can Liam make contact with Maddy and Sal without endangering history or being devoured by dinosaurs?.