SOS - Lost at sea

This book is about a teenaged girl named Sam. So had just graduated from north Crowley high school. She then gets accepted into a collage in Los Vegas where her aunt Sara lives. She then ask to moved in with her. Aunt. When things start to change for her. She then moves in with her room mates that happen to be twins. And there up to no good. So that same night the college decided to welcome the new students by having a party. She then notices a man that looks like he up to. Something bad.
He then pushes Sam off the cruise ship and she is lost at sea. But will she make it out alive!