Paleontology-loving Haven West and her older sister, Margie, have hardly talked with their mom since she retreated into a deep depression. Each morning Haven wonders if it's going to be a "good" or "bad" day, and the only thing that seems to occupy her mom is collecting fossils for her bone garden.

But one night, after an ominous moonlight heart-to-heart, her mom disappears--right before Haven discovers she's inherited a monstrous family trait. It turns out that she is the latest in a long line of cryptids, a past her mom has been hiding. Suddenly, the Texas terrain is full of ghostly dinosaur silhouettes and Haven is breaking out in scales at all the wrong moments. Even worse, she doesn't know whom she can trust with this information.

Since the only person who could guide her through this has vanished, Haven sets off on the road trip of a lifetime with Margie and their new friend Rye in tow. Together, they're determined to find her mom and finally get some answers, hopefully before Haven's secret is revealed . . .