Lara Williams takes a summer job aboard the luxury train Banebury, hoping for a fresh start, even with her complicated history with ex-friend Rhys. But their journey quickly turns strange when two mysterious carriages carrying rare and beautiful plants appear overnight. Along with the plants come Gwen and Gwydion, wealthy and enigmatic siblings whose intentions seem more than scientific. Lara senses something otherworldly about the blooms, a force determined to prevent the train from reaching its destination. As secrets unravel, she realizes she can’t escape her problems—they must be confronted at their roots. If Lara fails to uncover the Banebury’s mysteries, the consequences could be deadly.