Lord Peter was the second of the three children of Mortimer Wimsey, 15th Duke of Denver, and Honoria Lucasta Delagardie, who lives on throughout the novels as the Dowager Duchess of Denver. She is witty and intelligent, and strongly supports her younger son, whom she plainly prefers over her less intelligent, more conventional older son Gerald, the 16th Duke. Gerald's snobbish wife, Helen, detests Peter. Gerald's son and heir is the devil-may-care Viscount St George. Lady Mary, the younger sister of the Duke and Lord Peter, leans strongly to the political left and scandalises Helen by marrying a policeman of working-class origins.