I chanced upon a retired butcher named Demetz, in whose debt Cauvin had been to the extent of nearly two thousand francs. Demetz had been on the point of suing for the money when, to his intense surprise, Cauvin called one day with a bundle of thousand-franc notes in his hand, and threw out three, saying gleefully: "The extra thousand is for interest, my dear friend. I invented an improvement in automobile engines a year ago and patented it. A big firm in England has taken up my invention, and my fortune is made." Naturally enough, the retired butcher had been keenly interested in Cauvin's sudden wealth, and had tried to question him about it. But the postman's son was too wily to be drawn. He declared that the invention was a secret, that it would revolutionise the motor trade, and that the English syndicate which had bought it meant to spring it upon the market as a complete surprise. I soon found out that the man Cauvin was not popular. True, he flung his money about, and there were few local institutions which had not benefited by his largesse. But there is no population in the world so suspicious as the French provincial, and it was evident that the ex-postman's son had entirely failed in his prosperity to win either the affection or the confidence of those who had known him in his earlier and humbler days. Demetz voiced the prevailing suspicion. "Where does his money come from, monsieur?" he asked me. "From a motor invention--bah! What does Jules Cauvin know about motors? He had hardly ever been in one before he grew so suddenly rich. There is something mysterious about it all." But it was evident that even Demetz had not the least inkling of the real truth, and, of course, I did not breathe a syllable of it to him. The matter was of extreme urgency, and I did not allow the grass to grow under my feet. I had promised Doris to spend a week with her in Worcestershire, but this was impossible. I knew, however, that she had long wished for a trip to Mentone, so I sent her a wire, asking her to come with her mother and meet me there. A few hours after I got the reply I wished for, and the following afternoon I alighted upon the long platform at Mentone. Two days later I was joined at my hotel by Doris and her mother. In Mentone, of course, my objective was the Villa des Fleurs. I particularly wanted to have a good look round the interior of that interesting house. Cauvin, of course, was away, and the house was shut up, but I learned that it was being looked after by an old woman, the wife of the gardener, and accordingly I hired a _fiacre_ and, with Doris as my companion, drove out to the Villa des Fleurs.