From The Grey House:
Natalia had been instructed to keep an eye on Vincent’s movements in the restaurant: how often did he eat there? How often did his people stop by? Anything that would help Zechariah and the others plot. It turned out that Vincent did not spend enough time at the restaurant, and there were too many human lives at risk. Most of the people who came to The Ocean’s Edge were humans. Most of the members of The Red Thread were Hellspawn.