I saw last year that there was a new book, but it was only available in English in the UK. Well, in April it's coming out in North America, so I'll finally have to read book 4 so I can get to book 5. If you like dark stories with a Russian setting, give these a try.
Walking the streets of our cities are the Others. These men and women are guardians of the Twilight, a shadowy parallel world that exists alongside our own. Each has sworn allegiance to one side, fighting for the Light, or the Darkness. But now, beyond the continuing struggle comes a peril that threatens their very world. . .
At Moscow airport, Higher Light Magician Anton Gorodetsky overhears a child screaming that a plane is about to crash. He discovers that the child is a prophet: an Other with the gift of foretelling the future. When the catastrophe is averted, Gorodetsky senses a disruption in the natural order, one that is confirmed by the arrival of a dark and terrifying predator.
From the Night Watch headquarters Gorodetsky travels to London, to Taiwan and across Russia in search of clues, unearthing as he goes a series of increasingly cataclysmic prophecies. He soon realizes that what is at stake is the existence of the Twilight itself--and that only he will be able to save it.