"Yet, having found Dianne Alder and having tied her up, Boring suddenly lets her go.
"Now, why?"
Della Street merely sat looking at him, making no comment.
"The reason is, of course," Mason said, "that the advantage Boring intended to get from his contract with Dianne-and that must have been a considerable advantage for him to put out a hundred dollars a week-has been superseded by something much more profitable to Harrison Boring."
"Such as what?" Della Street asked.
"Blackmail."
"Blackmail!" she exclaimed.
"That's right," Mason said. "He started out on a missing heir's contract and he suddenly shifted to blackmail. That is about the only explanation that would account for his going to all that trouble to sign Dianne up on a missing heir's contract and then suddenly drop her."
"But why would blackmail tie in with missing heirs?" she asked.
"Because," Mason said, "we've been looking at the whole picture backwards. There aren't any missing heirs."
"But I thought you just said Dianne was a missing heir."
"We may have started in with that idea," Mason said, "but it's a false premise and that's why we aren't getting anywhere, and that's why Montrose Foster isn't getting anywhere. Dianne Alder isn't a missing heir; this is a case of a missing testator."
"What do you mean?"
"Dianne's father was killed some fourteen years ago, drowned accidentally while boating in the channel, but his body was never found."
"Then, you mean…?"
"I mean," Mason said, "that his body wasn't found because he wasn't dead. He was rescued in some way and decided to leave the impression that he was dead. He went out and began life all over and probably amassed something of a fortune.
"He probably was tired of his home life, wanted to disappear the way many men do, but never had the opportunity until that boating accident."
"So then?" Della Street asked, with sudden excitement.
"So then," Mason said, "we start looking for a wealthy man-someone who has no background beyond fourteen years ago, someone who couldn't divorce his wife because he was supposed to be dead, someone who has since remarried, someone who is exceedingly vulnerable, therefore, to blackmail.
"Dianne, as his daughter, would have a claim which could be enforced."
"But didn't Dianne's mother take all of the estate?" Della Street asked.
"All that she knew about," Mason said. "All the estate that Dianne's father left at the time of his disappearance. But technically he was still married to Dianne's mother. Technically anything that he acquired after his disappearance and before the death of Dianne's mother was community property."
"Then," Della Street said, with sudden excitement, "the key to the whole thing is George D. Winlock."
"Exactly," Mason said. "Winlock, the wealthy man whom Harrison Boring is cultivating at the moment; Winlock, the real estate speculator who showed up in Riverside about fourteen years ago as a salesman, who started plunging in real estate, became wealthy, and is now one of the town's leading citizens; Winlock, who has a high social position, a wife who really isn't a wife… No wonder Boring was willing to let Dianne off the hook! He had landed a bigger fish."
"I take it," Della Street said, "that we go to Riverside."
Mason grinned. "Get your things packed, Della. Put in some notebooks and pencils. We go to Riverside."
"And we see George D. Winlock?"
"We make some very careful investigations," Mason said, "and we are very, very careful indeed not to upset any apple carts, not to make any accusations, not to jump to any false conclusions, but very definitely we see George D. Winlock."
"And when we see him?"
"We see him as Dianne Alder's attorney, and the minute we do that I think you will find that Harrison T. Boring's blackmail has been dried up at the source. And, since Boring has repudiated his contract with Dianne, whatever we can get for her by way of a settlement will be pure velvet to her.
"How long will it take you to get some things
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