I guardiani del giorno - Dnevnoj dozer (Day Watch), by Sergei Luk'janenko (1998, Moscow)

The point of view now is different: the main character is Edgar, a dark wizard bound to Praga, where the Inquisition is going to bring an action between Igor, a Light wizard, and the Day Watch. This trial reveals to be the crux of the previous dark stories. Although a mystery remains about the global plot, Anton, Sveta, Alisa, Igor and some other characters' roles begins to get clear.
Intriguing.