Fortunately, husband-and-wife psychopaths are few and far between. A spate of cyclist killings leads Vance and Shepherd to investigate an apparently irreprehensible architect and his wife. When the architect, responsible for eco-friendly schemes, is elected deputy Mayor of Wandsworth, Vance’s suspicions seem even more bizarre until the wife is arrested for multiple killings using an ingenious drone device to detonate hidden unexploded World War 2 bombs in the area. Damian Devenish, the architect, is determined to punish society for the arrest of his lovely wife while remaining undetected. Vance and Shepherd disagree about the architect’s guilt. Yet, it is Shepherd who prevents Devenish from achieving his ultimate spectacular vendetta.