Twilight Watch — Sergei Lukyanenko

A dark and exhilarating hybrid of fantasy, vampire story, and detective potboiler, Twilight Watch is the third volume in the series that has become an international sensation.

Living among us are the "Others," an ancient race of humans with supernatural powers who must swear allegiance to either the Dark or the Light. A thousand-year treaty has maintained the balance of power between the two sides, but when a renegade Other absconds with a fabled book of spells and appears intent on using it to alter the course of humanity, the forces of Light and Dark must cooperate to stop him.

Anton, the hero from Night Watch, is back, but when the culprit turns out be an old friend, the race against time becomes more urgent than ever. In a world where reality and magic commingle, and where different degrees of existence are layered one atop the other, nothing is ever quite what it seems.