The Duke de Montvillier and George Hankey, who discovered silver in Los Madges, have moved into Kymott Crescent. Alicia Terrill, widow and relation of Sir Harry Tanner, finds the Duke a distinctly unpleasant neighbour. Sir Harry's son is sent to intervene. Unannounced, Sir Harry arrives with a stranger. 'The coming of Big Bill Slewer, ripe for murder and with the hatred he had accumulated during his five years' imprisonment', has played splendidly into his hands.