From The Grey House:
Rebecca was drinking a bad cup of coffee, wishing the safe house were across the street from a good coffee shop. She had been in worse surveillance situations though and shut her mind to the chatter. She watched Natalia out of the corner of her eye, wondering how she was going to get the homing device on the woman. It was a small device, designed to look like a quarter. It was marred on one side, as if someone had scratched up the backside. Rebecca was now twirling it slowly between her fingers, considering her options.
She thought that maybe the safe house was empty because it wasn’t the safe house. There was the possibility that The Hook Up was the actual meeting place. It was not a good idea, tactically, to have a safe house across the street from a twenty-four-hour establishment. Rebecca figured that someone here, either an employee or customer, was the point of contact. She wanted to figure out whom but didn’t want to look too suspicious. She was already quite conspicuous sitting in an Internet café without a computer. The public computers were by the wall, which was not a convenient place to watch her quarry. Therefore, she sat and looked at her watch, looking like she was waiting for friends.