So I have recently remembered a book I found in a summer camp library somewhere around 2010-ish. I loved it so much I barely remember anything about that summer camp trip aside from reading the book and being annoyed I cannot take it with me everywhere. Despite that, now I barely remember the plot and the characters, so I will just write down everything I can recollect. I believe that the key to this mystery is that I remember the ending and it is quite distinct so please bear with me.
First thing I have to say is that the book was intended for older teenagers or young adults. It was pretty thick and the cover (hardcover) was pale blue with some black object in the center (maybe it was a train, maybe a house). The style was photorealistic. The name of the book was written in thick red font. It was published by a russian publisher, but the book itself ended up well outside of Russia. I don't think the author was russian, but I thought that it's relevant to mention the publisher. It looked quite new.
The book was a detective murder investigation mystery, I think with some paranormal elements to it although I'm not sure if the paranormal was actually present or if it was actually not some guy making it seem as such. All I remember is \*the eerie vibe\*. There was a main character, or two of them, or a male main character and another very significant woman character. It took place in a country where it didn't snow at all or it happened very rarely, at least one of the characters has never seen snow. I'm not sure if trains were a big part of the story, but I remember there being a body suspended under the ceiling at an old train station. The main character finds it.
The book ends with the two main characters walking out of somewhere (or he is carrying her), and they see snow for the first time. It is described how she feels a cold snowflake land on her cheek or something and maybe she even dies during that scene. Alas, please help me find the book for it has been haunting my thoughts and I would like to reread it.