The stakes are higher than ever when the Raven sets Christopher up for a horrible crime, leading him to be locked away in London's most notorious prison. This terrible act is the first in a series of games the Raven plans to play with Christopher. Games that are as dangerous as they are challenging. Once free from prison, Christopher, Tom, and Sally engage in a cat and mouse game with the Raven that takes them all over London. Can Christopher outwit the Raven one final time and finally unmask him? And what price might he have to pay to achieve that? This is the thrilling conclusion to the Blackthorn Key series that fans have been waiting for!