What do this recurring dream mean?

Dream 1: me and my sister is sittin in her car and she's tellin me bout this dude she's been talkin to for a while and how he told her bout where she has been and gone, like he had been stocking her.~I woke up~ a few days later, Dream 2: I live around the corner from the dude she was tellin me about, so i go to his house to see my sister and when i get there she's in his room tied to the bed high of something. he was sittin in the living room. i didn't like that so i got her out of there some how...~I woke up~ few days later, Dream 3: I'm lookin for my sister but nobody has seen her, so i go to that dudes house again and once again she's there tied to the bed, high. this time i'm talkin to her tellin her that i dont like him while i search his room, and all she keeps sayin is " i'ts ok." then i pull on some strings that was hangin and a body of a woman fell out. by this time i'm tryin to get my sister out of there and tellin her that he's a serial killer, but all she said was, "i'ts ok." so i'm tryin to sneek her out without him knowin...~I woke up~ and i think there is more for me to dream but thats all for now...