Last watch (Cornerstone)

"The Last Watch" is the stunning sequel to the Night Watch trilogy, following the fortunes of the Others. Indistinguishable from normal people but possessed of supernatural powers and capable of entering the Twilight, a shadowy world that exists in parallel to our own, each Other owes allegiance either to the Dark, or to the Light...While on holiday in Scotland, visiting 'The Dungeons of Edinburgh', a young Russian tourist is murdered. As the police grapple with the fact that the cause of the young man's death was a massive loss of blood, the Watches are immediately aware that there is a renegade vampire on the loose. Anton - the hero of the Night Watch trilogy - is detailed to this seemingly mundane investigation, but begins to realise that there is much more to the story than a wildcat vampire and a single murder, and discovers that a team of unlicensed Others are hunting for a fabled magical treasure, hidden in the sixth level of the Twilight żeby Merlin himself.