Derek noticed the change in her demeanor and shifted in his seat so he could study her more closely. "We can call this off right now if you have a bad feeling," he said. "Maybe we need to catch her as she's leaving her next shift at the coffee shop."
Snatch her, tie her up, toss her in the back of the truck, and take her somewhere secluded so they could question her and figure out what was going on. It would give them the upper hand and they could arrange for more backup than one human.