Taking a latchkey from the girl and the coin from Hawker, Flambeau let himself and his friend into the empty house and passed into the outer parlour. It was empty of all occupants but one. The man whom Father Brown had seen pass the tavern was standing against the wall as if at bay; unchanged, save that he had taken off his black coat and was wearing a brown dressing-gown.
“We have come,” said Father Brown politely, “to give back this coin to its owner.” And he handed it to the man with the nose.
Flambeau’s eyes rolled. “Is this man a coin-collector?” he asked.
“This man is Mr Arthur Carstairs,” said the priest positively, “and he is a coin-collector of a somewhat singular kind.”
The man changed colour so horribly that the crooked nose stood out on his face like a separate and comic thing. He spoke, nevertheless, with a sort of despairing dignity. “You shall see, then,” he said, “that I have not lost all the family qualities.” And he turned suddenly and strode into an inner room, slamming the door.
“Stop him!” shouted Father Brown, bounding and half falling over a chair; and, after a wrench or two, Flambeau had the door open. But it was too late. In dead silence Flambeau strode across and telephoned for doctor and police.
An empty medicine bottle lay on the floor. Across the table the body of the man in the brown dressing-gown lay amid his burst and gaping brown-paper parcels; out of which poured and rolled, not Roman, but very modern English coins.
The priest held up the bronze head of Caesar. “This,” he said, “was all that was left of the Carstairs Collection.”
After a silence he went on, with more than common gentleness: “It was a cruel will his wicked father made, and you see he did resent it a little. He hated the Roman money he had, and grew fonder of the real money denied him. He not only sold the Collection bit by bit, but sank bit by bit to the basest ways of making money—even to blackmailing his own family in a disguise. He blackmailed his brother from Australia for his little forgotten crime (that is why he took the cab to Wagga Wagga in Putney), he blackmailed his sister for the theft he alone could have noticed. And that, by the way, is why she had that supernatural guess when he was away on the sand-dunes. Mere figure and gait, however distant, are more likely to remind us of somebody than a well-made-up face quite close.”
There was another silence. “Well,” growled the detective, “and so this great numismatist and coin-collector was nothing but a vulgar miser.”