Dana rides the same train every day, the same carriage and route, watching a man called Jamie. But she never says a word.

When Adam Johnstone joins a mysterious organisation, under the control of the visionary that is Nathaniel Yates, he doesn't realise that he will soon be part of the force responsible for the unravelling of society and humanity as we know it. Some 150 years later, in the authoritarian city of Ara, rumours of a distant threat emerge, and a group of insurgents find themselves imprisoned in the tower of Cassum. When a chance to escape presents itself, the group united seemingly by chance, embark on a journey of intrigue and discovery, finding that their lives are more linked than they might ever have imagined. Meanwhile, a venerable enemy grows, a new form of species that threatens all who cross their path. Could humanity's future lie in the hands of this group of strangers thrown together by forces perhaps stronger than fate?