This is the first book about the Detection Club, the world’s most famous and most mysterious social network of crime writers. Drawing on years of in-depth research, it reveals the astonishing story of how members such as Agatha Christie and Dorothy L. Sayers reinvented detective fiction. Detective stories from the so-called “Golden Age” between the wars are often dismissed as cosily conventional. Nothing could be further from the truth: some explore forensic pathology and shocking serial murders, others delve into police brutality and miscarriages of justice; occasionally the innocent are hanged, or murderers get away scot-free. Their authors faced up to the Slump and the rise of Hitler during years of economic misery and political upheaval, and wrote books agonising over guilt and innocence, good and evil, and explored whether killing a fellow human being was ever justified. Though the stories included no graphic sex scenes, sexual passions of all kinds seethed just beneath the sur