A second man had joined the game. There’d been only one in Rome; Arthur was certain of it. This new one was younger and as fair as his companion was swarthy.
Swarthy. It was not a usual word. Which is why, when it began appearing with strange and predicable regularity in the small notebook where Arthur recorded every detail of the vampire’s movements and behavior, it had clanged like a warning bell, drawing an experienced researcher’s attention as those sorts of things do.
– chapter 3, book 2, Blood Trilogy