“Mare is a geneticist,” said Ponter. “She is the one who proved during my first visit to this version of Earth that I was genetically what they call a Neanderthal.” He reached over and took Mary’s small hand in his own, massive, shortfingered one. “More than that, though, she is the woman I love. We intend to bond shortly.”

Lonwis’s mechanical eyes fell on Mary, their expression impossible to read. Mary found herself turning to look out the window of her office, here on the second floor of the old mansion that housed Synergy Group headquarters in Rochester, New York. The gray bulk of Lake Ontario spread to the horizon. “Well,” said Lonwis, or at least that was how his gold Companion translated the sharp syllable he uttered. But then his tone lightened and his gaze shifted to Ponter. “And I thought I was doing a lot for cross-cultural contact.”

Lonwis was one of ten highly distinguished Neanderthals—great scientists, gifted artists—who had marched through the portal from their world to this one, preventing the Neanderthal government from severing the link between the two realities.

“I want to thank you for that,” said Mary. “We all do—all of us here at Synergy. To come to an alien world—”

“Was the last thing I thought I would be doing at my age,” said Lonwis. “But those short-headed fools on the High Gray Council!” He shook his ancient head in disgust.

“Scholar Trob is going to work with Lou,” said Ponter, “on seeing if a quantum computer, like the one Adikor and I built, can be made using equipment that exists—how do you phrase it?—‘off the shelf’ here.”

“Lou” was Dr. Louise Benoît, by training a particle physicist; Neanderthals couldn’t pronounce the long ee phoneme, although their Companions supplied it as necessary when translating Neanderthal words into English.

Louise had saved Ponter’s life when he’d first arrived here, months ago, accidentally transferred from his own subterranean quantum-computing chamber into the corresponding location on this version of Earth—which happened to be smack-dab in the middle of the heavy-water containment sphere at the Sudbury Neutrino Observatory, where Louise had then been working.

Because she’d been quarantined with Ponter and Mary, as well as physician Reuben Montego, when Ponter had fallen sick during his initial visit, Louise had had a chance to learn all about Neanderthal quantum computing from Ponter, making her the natural choice to head the replication effort here. And that effort was a high priority, since sufficiently large quantum computers were the key to bridging between universes.

“And when will I get to meet Scholar Benoît?” asked Lonwis.

“Right now,” said an accented female voice. Mary turned. Louise Benoît—beautiful, brunette, twenty-eight, all legs and white teeth and perfect curves—was standing in the doorway. “Sorry to be late. Traffic was murder.”

Lonwis tipped his ancient head, obviously listening to his Companion’s translation of those last three words, but, just as obviously, completely baffled by them.

Louise came into the room, and she did extend her pale hand. “Hello, Scholar Trob!” she said. “It’s a pleasure to meet you.”

Ponter leaned close to Lonwis and whispered something to him. Lonwis’s brow undulated—it was a weird sight when a Neanderthal who still had eyebrow hair did it; it was downright surreal, Mary thought, when this centenarian did it. But he reached out and took Louise’s hand, grasping it as though he were picking up a distasteful object.

Louise smiled that radiant smile of hers, although it seemed to have no effect on Lonwis. “This is a real honor,” she said. She looked at Mary. “I haven’t been this excited since I met Hawking!” Stephen Hawking had taken a tour of the Sudbury Neutrino Observatory—quite the logistics exercise, given that the detector chamber was located two kilometers underground, and 1.2 kilometers horizontally along a mining drift from the nearest elevator.

“My time is extremely valuable,” said Lonwis. “Can we get to work?”

“Of course,” said Louise, still smiling. “Our lab is down the hall.”

Louise started walking, and Lonwis followed. Ponter moved close to Mary and gave her face an affectionate lick, but Lonwis spoke up without looking back. “Come along, Boddit.”

Ponter smiled ruefully at Mary, gave a what-can-you-do shrug of his massive shoulders, and followed Louise and the great inventor, closing the heavy, dark wooden door behind himself.

Mary walked over to her desk and started sorting the mess of papers on it. She used to be—what? Nervous? Jealous? She wasn’t sure, but certainly it had originally made her uneasy when Ponter spent time with Louise Benoît. After all, as Mary had discovered, the male Homo sapiens here at Synergy often referred to Louise behind her back as “LL.” Mary had finally asked Frank, one of the imaging guys, what that meant. He’d been embarrassed, but had ultimately revealed it stood for “Luscious Louise.” And Mary had to admit Louise was just that.

But it no longer bothered Mary when Ponter was with Louise. After all, it was Mary, not the French-Canadian, that the Neanderthal loved, and big boobs and full lips didn’t seem to be high on the Barast list of favored traits.

A moment later there was a knock on her door. Mary looked up. “Come in,” she called.

The door swung open, revealing Jock Krieger, tall, thin, with a gray pompadour that always made Mary think of Ronald Reagan. She wasn’t alone in that; Jock’s secret nickname among the same people who called Louise “LL” was “the Gipper.” Mary supposed they had a name for her, too, but she’d yet to overhear it.

“Hi, Mary,” said Jock in his deep, rough voice. “Do you have a moment?”

Mary blew out air. “I’ve got lots of them,” she said.

Jock nodded. “That’s what I’ve been meaning to talk to you about.” He came in and helped himself to a chair. “You’ve finished the work I hired you to do here: find an infallible method for distinguishing a Neanderthal from one of us.” Indeed she had—and it had turned out to be pig-simple: Homo sapiens had twenty-three pairs of chromosomes, while Homo neanderthalensis had twenty-four.

Mary felt her pulse accelerating. She’d known this dream job, with its hefty consulting fee, was too good to last. “A victim of my own genius,” she said, trying to make a joke of it. “But, you know, I can’t go back to York University—not this academic year. A couple of sessional instructors”—one of whom is an absolute bloody monster —“have taken over my course work.”

Jock raised a hand. “Oh, I don’t want you to go back to York. But I do want you to leave here. Ponter’s heading home soon, isn’t he?”

Mary nodded. “He only came over to attend some meetings at the UN, and, of course, to bring Lonwis up here to Rochester.”

“Well, why don’t you accompany him when he goes back? The Neanderthals are being very generous about sharing what they know about genetics and biotechnology, but there’s always more to learn. I’d like you to make an extended trip to the Neanderthal world—maybe a month—and learn as much as you can about their biotechnology.”

Mary felt her heart pounding with excitement. “I’d love to do that.”

“Good. I’m not sure what you’ll do about living arrangements over there, but…”

“I’ve been staying with Ponter’s man-mate’s woman-mate.”

“Ponter’s man-mate’s woman-mate…” repeated Jock.

“That’s right. Ponter is bonded to a man named Adikor—you know, the guy who co-created their quantum computer with him. Adikor, meanwhile, is simultaneously bonded to a woman, a chemist named Lurt. And when Two aren’t One—when the male and female Neanderthals are living separate lives—it’s Lurt that I stay with.”

“Ah,” said Jock, shaking his head. “And I thought the Y&R had confusing family relationships.”