"Sales psychology is just a study of human weaknesses. And that's a funny thing, you know. I remember the manager of one of the biggest novelty manufacturers in the world telling me that the soundest test of any idea for a new toy was whether it would appeal to a middle-aged business man. It's true, of course. It's so true that it's almost stopped being a joke — the father who plays with his little boy's birthday presents so energetically that the little boy has to shove off and smoke papa's pipe. Every middle-aged business man has that strain of childishness in him somewhere, because without it he would never want to spend his life gathering more paper millions than he can ever spend, and building up rickety castles of golden cards that are always ready to topple over and be built up again. It's just a glorified kid's game with a box of bricks. If all the mighty earth-shaking business men weren't like that they could never have built up an economic system in which the fate of nations, all the hunger and happiness and achievement of the world, was locked up in bars of yellow tooth-stopping." Simon raised his eyes suddenly — they were very bright and in some queer fashion sightless, as if his mind was separated from every physical awareness of his surroundings. "Lewis Enstone was just that kind of a man," he said.
"Are you still thinking of that toy you were playing with," Teal asked restlessly.
"That — and other things we heard. And the photographs. Did you notice them?"
"No."
"One of them was Enstone playing with a clock-work train. In another of them he was under a rug, being a bear. In another he was working a big model merry-go-round. Most of the pictures were like that. The children came into them, of course, but you could see that Enstone was having the swellest time."
Teal, who had been fidgeting with a pencil, shrugged brusquely and sent it clattering across the desk.
"You still haven't shown me a murder," he stated.
"I had to find it myself," said the Saint gently, "You see, it was a kind of professional problem. Enstone was happily married, happy with his family, no more crooked than any other big-time financier, nothing on his conscience, rich and getting richer — how were they to make him commit suicide? If I'd been writing a story with him in it, for instance, how could I have made him commit suicide?"
"You'd have told him he had cancer," said Teal caustically, "and he'd have fallen for it."
Simon shook his head.