Somewhat incredibly, it's 20 years since we were first introduced to Bryant and May – so it seems only appropriate that the secret history of the PCU itself should be woven into the plot of the highest-stakes game they have yet to play. The story of Amelia Hoffman and her two accomplices in state-trained deception, Annie Wynn-Jones and Angela Carey, is the most complex and corkscrew plot their fiendishly clever creator has ever come up with. As devotees have come to expect, it is one that shines its torch of enquiry into the most well-concealed nooks and crannies of London's labyrinthine past, this time in the form of London Bridge itself – a structure that made the Capital's earliest beginnings possible; once displayed the heads of such 'traitors' as Thomas' Moore and Cromwell, hosted the frost fairs caused by the manner of its construction and then disappeared and reappeared again in the unlikeliest of settings.
Tragically, it is also the final case for crime fiction's most brilliantly original dynamic duo, and one that, as has been hinted at in their previous three adventures, takes the series full circle. To do justice to Bryant and May's work, and Christopher Fowler's achievement in getting it all down in print, the annals of London will record him as one of the city's most Capital writers of all.