Having acquired the first three charms in the quest to secure their family's freedom, Luka and Emilia flee into Sussex with soldiers hot on their heels, in company with a Royalist duke, a Catholic priest, a highwayman and young Tom Whitehorse. Only the Catholic underground can help them all escape – but this is a most dangerous religion in the time of Puritan rule. And Emilia and Luka still must find the elusive gypsy tribe of the cat's eye shell, who, it seems...
The first message sent to Tom Thorne's phone was just a picture - the blurred image of a man's face, but Thorne had seen enough dead bodies to know that the man was no longer alive. But who was he? Who sent the photograph? And why? While the technical experts attempt to trace the sender, Thorne searches the bulletins for a reported death that matches the photograph. Then another picture arrives.