Did you know that the Russian pronoun кое is used when one knows what he (she) is talking about, but does not want to mention it for some reason (it is a secret or it is not important)? It is also very important to know that the prepositions, used with this pronoun, are always put in the middle.
Я хочу тебя кое с кем познакомить. I want to introduce you to somebody.
Я получила подарок кое от кого. I received a present from somebody.