The city of dragons. Book is fourth

The city of dragons squeezes claws!
The city, who slept for two centuries under eternal snow, wakes up to resist the deadly threat! The city, which seemed easy prey, exposes the true essence.
And now the bets are much higher.
A student of Professor Stonton approaches the unraveling of the secrets of the murders in Westernadan when he receives a frightening message from the beast: "once, two, three, four ... without five, I go to look for you. The beast goes hunting and no longer hides its goal. So who is he, a monster who is not aware of his monstrous essence? What will the guest telling about the door tapping the door? And is it true that serial killers are from those who are sincerely devoted to Lord Davernetti?
Miss Anabel Waerti decisively continues his more than dangerous investigation