Inspired by C. S. Lewis's The Chronicles of Narnia, this wild and wondrous novel is a fairy tale for grown-ups who still knock on the back of wardrobes—just in case—from the author of The Wishing Game.

As boys, best friends Jeremy Cox and Rafe Howell vanished in a West Virginia state park, only to mysteriously reappear six months later with no explanation for where they'd gone or how they'd survived.

Fifteen years after their miraculous homecoming, Jeremy is a famous missing persons investigator with an uncanny ability to find the lost, while Rafe is a reclusive artist unable to stop creating otherworldly paintings and sculptures he shows to no one. He bears scars inside and out from his disappearance but has no memory of what happened while they were gone.

Jeremy alone knows the fantastical truth behind their time in the woods. While the rest of the world was searching for them, the two missing boys were in a magical realm filled with impossible beauty and terrible danger. However, Jeremy has kept Rafe in the dark since their return for his own inscrutable reasons.

But the time for burying secrets comes to an end when vet tech Emilie Wendel hires Jeremy to find her long-lost sister... the long-lost sister he and Rafe knew while living in that hidden kingdom. Now the former lost boys must confront their shared past, no matter how traumatic the memories. Alongside the headstrong Emilie, Rafe and Jeremy return to the enchanted world they called home for six months... for only then can they get back everything and everyone they've lost.