so доложить here means to denounce someone to the police with information?

Not necessarily to the police. May be a better word "to inform on" (kind of to betray)

In Russian we can also say донести, настучать

Uly, you wrote "you'd've turned"- is it informal way of writing?

Thank you, Elena. But "inform on" implies denouncing someone to an authority, usually the police, but also the FBI, the principal of a school, upper management at a company, etc. We actually use "turn somebody in" in this situation. Thank you for your answer :)

It's funny, I've never thought about the "correctness" of long contractions like I'd've and you'd've. I guess since it's natural to pronounce these verbs this way, it's correct to write them too. Especially since this original sentence is something one would say in a dialogue. Good question!

I found this: http://english.stackexchange.com/questions/689/is-idve-proper-use-of-the-english-language

One more thing, when I typed those contractions, my computer didn't autocorrect them, so they must be in the standard dictionary :) I think they look cool - use them!

By the way, they're pronounced а́йръв and ю́ръв.

To turn in - i'll try to remember. Thank you, Uly. They are really cool, these contractions:)

Anytime!