The last thing Jonah Sands expected on his thirtieth birthday was to have his life thrust into the hands of a dangerous, red-haired woman—or to be the only person in the world to survive an encounter with her. As the death toll skyrockets, Jonah and his two best friends, the siblings Tristan and Ava Carter, find themselves at the epicentre of inexplicable phenomena—a stranded ferry transforms into a barge headed for the Underworld; young girls levitate to whisper ancient riddles; technology across the globe is controlled by some unseen hand. And it all seems to lead back to the woman with red hair. When a stranger finds them in the midst of a thunder storm and offers his otherworldly assistance, Jonah finally unravels the truth about who he really is. And what it means for the rest of humanity.