They both lost interest at about the same time.  Nick couldn’t crack into the Cypriot detective’s laptop.  Even when he walked away from the problem, went downstairs to play a few hands of blackjack and returned with a freshened perspective, he couldn’t get in.

He wasn’t put off by the challenge as much as he was aware of vanishing motivation.  Nick’s curiosity was all but gone.  He sensed Caroline shared his fading fascination.

When they both lost interest in opening the Cypriot detective’s laptop, they figured it was time to leave the hotel.