How far will you go to open The Bone Door? When Hop awakens in an ancient labyrinth, he has no memory of his life or how, indeed, he got here. He does not recognise the mysterious girl trapped with him. And he certainly cannot identify the shadowy figure stalking him, whispering terrible things . . . But there is one thing he is certain of. He must escape. The only way out of the labyrinth is through The Bone Door. But it lies behind a series of locked doors hidden across an array of realms. As Hop travels deeper into the maze, he discovers that he and his companions may be more connected to the place and its horrors than he could ever imagine.

For a thousand years, Concordia has maintained peace between its provinces. To mark this incredible feat, the emperor's ship embarks upon a twelve-day voyage to the sacred Goddess's Mountain. Aboard are the heirs of the twelve provinces of Concordia, each graced with a unique and secret magical ability known as a Blessing. Except one: Ganymedes Piscero - class clown, slacker, and all-round disappointment. When a beloved heir is murdered, everyone is a suspect. Stuck at sea and surrounded by powerful people without a Blessing to protect him, odds of survival are slim. But as the bodies pile higher, Ganymedes must become the hero he was not born to be. Can he unmask the killer and their blessing before this bloody crusade reaches the shores of Concordia? Or will the empire as he knows it fall?