Dick Kirby reopens the casebook of Fred Wensley OBE KPM, the Somerset gardener who joined the Metropolitan Police in 1888 and within months began arresting murderers. An enormously successful detective, he cracked high profile cases including the Bessarabian, Odessa and Vendetta gangs; he played a decisive part in the Siege of Sidney Street; and investigated – although unsuccessfully – the serial murders by Jack the Ripper.