Steinerne Schwingen (2014)

(from the back of the book)
At night they prowl in the streets of the city. During daytime they sit quietly and watch the good citizens of Gareth from roofs, walls and gutters, disguised as inanimate statues, gargoyles. But where do the stone guardians of the city come from? What are their goals, and the nature of their connection to strange alleys of the imperial city, which are commonly known as Neverroads? And why is the party followed by a mysterious stone girl?

Your heroes will find answers to all these questions in this adventure. They will discover an ancient secret of Gareth, that dark powers would be happy to get, for it holds the key to death and destruction.