Twelve-year-old Evie didn't mean to get lost--especially in the Cretaceous period! Now she's alone, without her parents or anyone else to turn to for help. That is until she rescues a baby pterosaur and raises it on her own. As the baby grows into a giraffe-sized flying reptile, which Evie names Ada, the two manage to to find a way to survive in the prehistoric wilderness.

But Evie will have to risk everything when she makes a discovery that may just be her only chance of returning home. Putting Ada's flying skills to the ultimate test, the duo must embark on a journey halfway across the world--battling all nature throws at them, from fearsome dinosaurs to raging storms. Will Evie manage to overcome all the odds and find a way back to her family... or is she truly lost in time?