This is the second book in the series "The Mysteries of Venetta" - an adventure fantasy in the 16th-century Venice. Francesca returns to Venetta and is once again caught in the web of political intrigue. Anyone in this city can betray. But if her old friend is a traitor, then maybe the old enemy will come to the rescue? The first book here (Seabound): https://www.royalroad.com/fiction/31503/heart-of-a-seagull The translation was made by my sister, Mia Velisarova.