Soulmates Eric and Shelly are brutally murdered when the demons of her dark past catch up with them. Given the chance to save his true love by sacrificing himself, Eric sets out to seek merciless revenge on their killers, traversing the worlds of the living and the dead to put the wrong things right.
A young man, of Romani descent, returns to his hometown of Gloucester. He is met by local garage mechanic, Dunleavy. They embrace, smiling. But what past does the young man carry with him? What awaits him back amongst people he doesn't really understand and who don't understand him? And what lurks in the forest, watching, silent, old as the trees?
Depicting an epic 26th-century conflict between humanity and an alien threat known as the Covenant, the series weaves deeply drawn personal stories with action, adventure and a richly imagined vision of the future.