OK, You got me (it was too long to answer in comment form so I had to post it for real). It's cracky, un-beta'd and just knocked up off the cuff so don't blame me for lack of good things within.
Catherine and Sara prevent a crime.
Thomas Crown Affair (1999 version)
"Sara?" The (off duty) CSI was currently enthralled by a painting of some stupid European waterfront skyline enshrouded in a red dusk but she turned at Catherine's question.
"Yep?" Sara smiled but it was only a vague distracted lift of the lips, her polite smile, the one she gave to victims and suspects alike, the one she had been giving Catherine ever since she started at the Las Vegas lab and the one that was starting to drive the senior CSI crazy. Admittedly Sara hadn't got off to that good a start with any of the crew, what with investigating Warrick and being best friends with the boss. But still, there was something about that polite smile that made Catherine even more determined, that had nudged her to agree to this joint expedition on the one free afternoon they had at this New York conference. She suddenly realised she'd been silent too long and that vague glance had hardened into Sara's more usual penetrating glare. Catherine remembered what she'd meant to say.
"Why did you drag me here?" She waved an explanatory hand. "I'm as fond as art as the next person," she watched a small group of unwilling children being dragged through the gallery on squeeky feet, "but I'm beginning to see the attraction of that ice-cream you bribed me with, somewhere with chairs would be nice. I didn't know you even liked this kinda stuff."
Sara shrugged. "They're mathematically interesting."
Catherine drifted over to her side, letting the maths comment slide. These fuzzy representations were nothing to do with sums, but if Sara wanted her to pretend that then she would. So the new CSI liked fuzzy art. It was an intriguing thought and more than made up for Catherine's long morning. Room after room of pictures, none of them well painted enough that you could tell what they were supposed to be. Venice at Dusk the little card said. Venice. Hmmph. You'd never get a sunset like that in real life. Not even over the desert. Talking of the desert, was it hot in here or was it just her? The blond CSI glanced about the room, her experienced eye picking out something odd in one of the benches.
"Look." Catherine nudged Sara gently, trying to grab her attention without alerting the entire room. "Can you see what I see?"
Sara swept an examining gaze around the room and tensed as her eyes fell on the second bench. Her voice however was very calm and low as she said "we need to get everyone out of here."
"I concur." Catherine could still here the sound of the children in the next room and her blood froze as the terrible possibilities flashed behind her eyes. "I'll explain to security, you start getting people moving."
"Ok."
It was simple enough, the museum had an evacuation plan and before long the steps outside were swirling with a confused mass of people inquisitive but not as yet concerned. Catherine, released by the chief of security on the understanding that she would give a statement at the police station later, forced her way through the crowd hunting for a distinctive tall figure. In the end it was Sara who found her however, emerging from the mob to grab her hand as she passed. Catherine turned and caught the anxious gaze.
"It was a heater" she explained and saw the worry vanish out of those dark eyes to be replaced by a quick curiosity.
"A heater?"
"They think it was some kind of heist." Catherine shrugged. "They're not sure exactly how but the guy said he'd keep me informed."
"And how many times did you have to flutter those luscious eyelashes to get him to agree?"
"Only a couple." She grinned. "Interdepartmental co-operation and that. They're so pleased we caught it that they'll do anything for us. Now, I believe someone promised me an ice-cream."
"Into the park then?"
"And later we can test out some of this wonderful cuisine New York is apparently so famous for." Catherine ignored Sara's attempts to refuse, adding a persuasive "You have to eat sometime and I got the security chief to recommend a great vegetarian place." Sara was no better at negotiating than Lindsay and magnanimous in victory the blond CSI began forging a way through the crowd as she led the way around the side of the building.
The park lay cool in the summer heat and they wandered along the neat paths in companionable silence as they kept an eye out for an ice-cream truck. Catherine, stretching her legs to keep up with her co-workers relaxed stride forbore to mention the offer of a evening visit to the museum after the punters had gone. That was something she would keep back for Sara later, on the way to dinner.