Frankie Varg of the Eurocrimes Division heads to Tallinn, Estonia, in search of her young cousin who's believed to have dropped out of university to join One World, a religion many believe to be nothing more than a fanatical cult. Hot on her heels is her field partner Peter Ash, who's searching for the identity of a woman’s charred body found in the woods close to Tallinn. When Peter arrives in the city, he finds Frankie attempting to infiltrate One World by posing as a runaway sleeping rough. Brought into One World’s all-encompassing embrace, Frankie is shown the work the organisation does with the homeless around the world. But is it all a cover-up for their more nefarious activities? Who is their leader, the mysterious Shepherd? What clues will the burnt body uncover . . . and is Frankie out of her depth?