October 1940. Bombs are falling on Stratford when air-raid warden Sylvia Parks sees a house with a shining light in clear breach of the city's strict blackout rules. With no answer at the door she manages to break in only to discover the body of a young woman strangled to death with a stocking. For Detective Inspector John Jago the scene brings back memories of the gruesome Soho Strangler who murdered four women a few years ago but has never been caught - could there be a connection?