When Lara Williams gets a summer job aboard the luxury train the Banebury, she thinks she's landed a five-star escape from her past. Even after she learns that her ex-friend Rhys, who she definitely did not have feelings for before their relationship imploded, is one of her coworkers, she's determined to make things work.

But on the first day of their journey, the trip takes a strange turn. Two mysterious carriages filled with an array of beautiful and rare plants are attached to the Banebury in the middle of the night.

And with them comes a pair of siblings. Wealthy, mysterious, and charismatic, Gwen and Gwydion claim the plants they're transporting are for research, but Lara can't shake the feeling that there's something . . . otherworldly about the strange blooms. Something that will stop at nothing to ensure the Banebury never reaches its destination.

Soon Lara will learn: You can't outrun your troubles. You have to grab them by their roots. And if she can't unearth the secrets of the Banebury, they might drag her down for good. . . .