“I couldn’t, your Grace,” urged the policeman. “If I was found out I should get the sack.” “You should come to no harm by that.” “And if your Grace was found out----” “You can leave that to me,” interrupted the Duke. Presently the policeman, acting on the Duke’s invitation, climbed into the window of the villa, and the conversation was continued across the table. The Duke urged, produced money, gave his word to be responsible for the policeman’s future; the policeman’s resistance grew less strong. “I am about your height and build,” said the Duke. “It is but for a few hours, and you can spend them very comfortably in the kitchen. Before six o’clock I will be back.” “If the Inspector comes round, your Grace?” “You must take a little risk for twenty pounds,” the Duke reminded him. The struggle could end but one way. A quarter of an hour later the policeman, attired in the Duke’s overcoat, sat by the kitchen hearth, while the Duke, equipped in the policeman’s garments, prepared to leave the house and take his place on the beat. “I shall put out all lights and shut the door,” said he. “The window of this kitchen looks out to the back, and you will not be seen. You will particularly oblige me by remaining here and taking no notice of anything that may occur till I return and call you.” “But, your Grace, if there’s murder done----” “We can hardly expect that,” interrupted the Duke, a little wistfully. Yet, although, remembering how the humdrum permeates life, he would not pitch his anticipations too high, the Duke started on the expedition with great zest and lively hopes. The position he had assumed, the mere office that he discharged vicariously, seemed to his fancy a conductor that must catch and absorb the lightning of adventurous incident. His big-buttoned coat, his helmet, the lantern he carried, his deftly hidden truncheon, combined to make him the centre of anything that might move, and to involve him in coils of crime or of romance. He refused to be disappointed although he tried a dozen doors and found all securely fastened. For never till the last, till fortune was desperate and escape a vanished dream, was wont to come that marvellous Door that gaped open-mouthed. Ah! The Duke started violently, the blood rushing to his face and his heart beating quick. Here, at the end of the lane most remote from his own villa, at a small two-storeyed house bright with green paint and flowering creepers, here, in the most unlikely, most inevitable place, was the open door. Barred? It was not even shut, but hung loose, swaying gently to and fro, with a subdued bang at each encounter with the doorpost. Without a moment’s hesitation the Duke pushed it open. He stood in a dark passage. He turned the glare of his bull’s-eye on the gloom, which melted as the column of light pierced it, and he saw-- “There is nothing at all,” said the Duke of Belleville with a sigh.