Dr. Grace Carson is one of the lucky few scientists cleared for time travel. Years ago, her husband nearly destroyed her career by poaching dinosaurs. Grace turned him in, divorced the deadbeat, and two years later she's ready to return to the work she loves: studying dinosaurs in their natural habitat. She has no interest in the new time agent, Ben Nakamura, assigned to her research station. No matter how charming or clever he is.

Unfortunately, her team isn't alone. Poachers are trapping dinosaurs for the black market again. Another scandal like this could kill her research if it comes out, and Grace's boss wants her to look the other way until the thieves are gone. But Grace can't bring herself to let the criminals get away.

When the poachers discover Grace's plans to blow the whistle, they attack her research station. Nakamura and Grace flee into the forest with her time machine, but it's broken in the process. Nakamura knows a secret cache where they can hopefully fix the time machine, but it means a perilous trek through the wilderness.

Braving prehistoric dangers together shows Grace she can trust Nakamura with her life, but she's still not sure she can ever trust him with her heart.