The workers in a small furniture-making business throw out their employer, who had been cheating them, and take over the business for themselves - but when he is found dead they are suspected of murder.
An early automobile and it's potentially lucrative patents lead to it's inventor's murder. Cork and Marriott find many suspects, including the mechanic, two feuding financial backers and a farmer who's son was injured by the machine.
Albert Watson, received the Victoria Cross for bravery on the North West Frontier of India. During a quarrel with his father, Albert kills him, and barricades himself in his house with Sergeant Cork as hostage.
A music-hall mystic predicts the murder of an MP, and when he is found dead later that evening becomes an obvious lead for questioning - but Cork can do nothing to shake her from her claims of 'second-sight'.