Today, twelve golden tablets sit in museums around the world, each buried in ancient times, and each providing the dead with the route to the afterlife. Archaeologist Lily Barnes, working on a dig in Italy, has just found another. But this tablet names the location of the mouth of hell itself. And then Lily vanishes. Her husband, Jonah, is desperate to find her. But no one can help him: not the police and not the secretive foundation that sponsored her dig. All Jonah has is belief, and a determination to do whatever it takes to get Lily back. Jonah will discover the journey ahead is mysterious and fraught with danger. And not everyone who travels to the hidden place where Lily has gone can return.