One morning when he returned home to _déjeuner_, after a walk in the direction of Chaillot, he found a gilt-edged visiting-card awaiting him, on which was written Gilquin's name. The card was very dirty, and bore the marks of greasy fingers. Rougon rang for his servant. 'Did the person who gave you this card leave any message?' he asked. The servant, who was new to the house, smiled. 'It was a gentleman in a green overcoat,' he replied. 'He was very pleasant and offered me a cigar. He only said that he was a friend of yours.' However, just as the servant was leaving the room he turned and added: 'I think there's something written on the back of the card.' Rougon turned it over and read these words written in pencil: 'Can't wait. Will call again this evening. Very urgent; a strange business.' Then he threw down the card with a careless air. After _déjeuner_, however, the expression 'Very urgent; a strange business,' recurred to his mind and haunted him, till it at last rendered him quite impatient. What could this 'strange business' of Gilquin's be? Since Rougon had charged the ex-commercial traveller with sundry obscure and intricate commissions he had seen him regularly once a week in the evening. Never before had Gilquin called in the morning, so that the matter in hand must surely be something out of the common. Rougon, quite at a loss to guess its nature, found himself all aglow with impatience, and although he could not help feeling that it was ridiculous, he resolved to go out and try to discover Gilquin before the evening. 'Some tipsy story, I dare say,' he reflected as he went through the Champs Élysées. 'Well, at any rate I shall satisfy myself.' He was on foot, as he wished to carry out the directions of his doctor. It was a lovely day; a bright, sunny January noontide. Gilquin appeared to have removed from the Passage Guttin, for his card bore the address Rue Guisarde, Faubourg Saint-Germain. Rougon had an immense amount of trouble to find this filthy street, which is situated near Saint-Sulpice's. At the end of a dark passage he discovered a woman lying in bed, who called out to him in a voice which quavered with fever: 'Monsieur Gilquin! I don't know whether he's in. It's the door on the left on the fourth floor, right up at the top.'