his throat, and Diego Hererra's father was close behind him, holding him in an astonishingly powerful grip.
"Now, you sonovabitch," Hererra said, "you'll tell me everything you know about my son's murder, or by Christ's tears I'll slit your throat from ear to ear."
Chapter Seventeen
BUD HALLIDAY SAT in a semicircular banquette at the White Knights Lounge, a bar in an out-of-the-way area of suburban Maryland where he often came to unwind. He nursed a bourbon-and-water while he tried to clear his mind of the clutter that had built up over the long day.
His parents were Mainline Philadelphians who could trace their respective families back to Alexander Hamilton and John Adams, respectively. They had been childhood sweethearts who, with the predictability of their ilk, were divorced. His mother, a society doyenne, now lived in Newport, Rhode Island. His father, plagued with emphysema from years of inveterate smoking, rattled around the family mansion, trailed by oxygen tanks and a pair of full-time Haitian nurses. Halliday saw neither of them. He'd turned his back on the hermetically sealed golden glow of their society world when, to their horror and mortification, he had gleefully enlisted in the marines at the age of eighteen. While at boot camp he had imagined his mother fainting at the news, which gave him a great measure of satisfaction. As for his father, he'd probably chewed off the end of his cigar, blamed his wife for his disappointment, and gone off to the insurance company he owned, and which he ran with ruthless and appalling success.
Finding that he'd finished his bourbon, Halliday flagged down the waiter and ordered another.
The twins arrived at the same time as his drink, and he ordered them chocolate martinis. They sat down on either side of him. One was dressed in green, the other in blue. The one in green was a redhead, the other blond. Today, at least. They were like that, Michelle and Mandy. They liked to play off their eerie echoes of each other, but at the same time asserting their differences. They were tall, almost six feet, with figures as lush and luscious as their lips. They could have been models, or possibly even actresses, given the expert way they played roles, but were neither vain nor empty-headed. Michelle was a theoretical mathematician, and Mandy was a microbiologist at the CDC. Michelle, who could have had her pick of chairs at any of the top universities in the country, instead worked for DARPA - the Defense Advanced Research Projects Agency - cooking up new cryptographic algorithms that could foil even the fastest computer, even used in tandem. Her latest used heuristic techniques, meaning it learned from every attempt to break it, as if it were a self-educating entity, changing on the fly. It required a physical key to unlock it.
Never had two more fertile minds been wrapped in such delectable and erotic packages, Halliday thought as the waiter set their chocolate martinis in front of them. They all raised their glasses in a silent toast to another night together. When they were off duty, the girls loved sex, chocolate, and sex, in that order. But they weren't off duty yet.
"What's your assessment of the ring?" Halliday asked Michelle.
"It would help," she said, "if you had given me the real thing instead of a set of photos."
"Given that I didn't, what's your best guess?"
Michelle took a sip of her drink as if needing time to set her thoughts in order or to figure out how to express them to Halliday, a mental midget compared with her and her twin.
"It seems likely to me that the ring is a physical key."
Halliday got interested in a hurry. He was keeping a sharp lookout. "Meaning?"
"Just what I said. It may be the algorithm I'm working on, but the odd inscription on the inside of the ring appears to me to be like the ridges of a key." Responding to Halliday's quizzical look, she changed tack. Taking out a felt-tip pen, she drew on Halliday's napkin.
"Here we have a common key to a lock. It has ridges cut into it that are unique to it. Most common locks have twelve pins inside the lock cylinder, six upper and six lower. When the key is inserted in the cylinder, the ridges raise the upper pins above the shear line, allowing the shaft inside the cylinder to turn and the lock to open.
"So now consider each ideogram of the engraving inside the ring as a notch. Slip