The invitation had said black tie. Alex had learned, over the years, that "black tie" in Sinclair circles meant something closer to "royal wedding," and she'd dressed accordingly, deep emerald silk, the kind of dress that cost more than her first month's rent out of college, chosen specifically because it made her feel like she could survive anything the evening threw at her.
She needed that feeling tonight.
The Sinclair estate in Greenwich lit up the dark like its own small city, string lights strung through century-old oaks, a string quartet somewhere near the fountain, waitstaff moving through the crowd with trays of champagne that cost more per glass than most people's rent. Alex had been to a hundred parties like this. She'd never had this much riding on one.
Nate met her at the door himself, which she hadn't expected, and for a moment, just a moment, the sight of him in a tux, dark hair pushed back, doing absolutely nothing to hide how good he looked, threw her off her rhythm.
"You clean up well," he said, offering his arm.
"I always clean up well. Try to keep up."
He laughed, a real one, surprised out of him, and something about that felt like a small victory.
"Rules," she said quietly as they walked, her hand tucked into the crook of his elbow, her smile fixed at the exact wattage she used for donor events. "Your grandfather first. Don't let anyone else get to him before we've set the tone. After that, we circulate separately, but not for long, no more than fifteen minutes apart, or it looks like we're avoiding each other."
"You've done this before."
"I've fixed this before. Different thing." She caught the way his jaw tightened, just slightly, and softened her voice. "Where is he?"
"Terrace. He likes the air. Says the house is too full of people who want something from him."
"Smart man."
"He'll like you," Nate said, and there was something almost rueful in it. "That's what worries me."
They found Whitmore Sinclair in a wheelchair near the terrace railing, a blanket over his knees despite the mild evening, a glass of scotch he clearly wasn't supposed to be drinking held loosely in one hand. He had his grandson's eyes, sharp, assessing, but seventy years of use had turned them into something closer to a searchlight.
"So this is her," he said, before Nate could even make the introduction. "The one who's got half of Manhattan talking."
"Alexandra Whitfield." She extended a hand, steady, warm, exactly as practiced. "Happy birthday, Mr. Sinclair."
"Call me Whit. Everyone who matters does." He didn't let go of her hand right away, studying her face like he was pricing a piece of art. "You're not what I expected."
"What did you expect?"
"Someone easier to see through." He said it almost approvingly, and behind her, she felt Nate go very still. "My grandson has a type, Ms. Whitfield. Beautiful and empty-headed and gone within the season. You don't strike me as any of those things."
"I try not to be gone within the season, no."
Whit laughed, a dry, rattling sound that turned into a cough, and Nate was at his side instantly, a hand on his shoulder, and Alex watched something pass between them, worry, wordless and real, that had nothing to do with the performance they were both supposed to be giving.
"I'm fine," Whit said, waving him off, though his voice had thinned. "Go dance with your girl, Nathaniel. Let an old man enjoy the illusion that his family still knows how to have a good time."
Nate hesitated, and Alex, without quite deciding to, put her hand over his where it still rested on his grandfather's shoulder.
"We'll come find you before we leave," she said to Whit, gently. "Don't let anyone finish that scotch for you."
"I like her," Whit said to Nate, as if she weren't standing right there. "Don't screw this up."
---
The dance floor had been cleared beneath a canopy of lights, and Nate pulled her into position with an ease that suggested this, at least, wasn't a performance, some skills, apparently, were just bred into men like him.
"You're good at that," he murmured, close to her ear. "My grandfather doesn't warm to people. Ever."
"I'm good at my job."
"Is that what this is? A job?"
Something in his tone had shifted, low and careful, and Alex made the mistake of looking up at him instead of over his shoulder like she'd planned.
Bad idea. Up close, under the lights, with his hand warm at her waist and the champagne doing something unhelpful to her judgment, Nathaniel Sinclair was a genuinely dangerous man to be this near to.
"It's an arrangement," she said. "We agreed."
"We agreed to six weeks of appearing convincing." His thumb moved, barely, against the silk at her waist, and she felt it everywhere. "Nobody said anything about how convincing."
"Nate…"