Rabbit, Strauss and Mabel are on the case of a mysterious killer who takes the guise of the Brick Man, a mythical figure from London folklore. And Lydia emerges from the shadows with designs on Mabel.

There's a sniper on the loose. A really bloody good one - he shot two men dead with the same bullet. The attacks appear to be completely random - a church warden in Bow, a solicitor in Clerkenwell. There's no pattern. No logic. And therefore no way of stopping it.