Troubled Marine sister

You never thought that you would ever lose someone you loved so much but what happens when you do? Cassandra isnt a typical teenager, she gets into trouble a lot. The only reason she is like this is because her brother Louis left for the Marine Corps about 6 months ago. Cass was a normal teen, she got straight A's and she never stayed out late. Ever since her brother left she went out partying and hanging out with the crowd. What happens if Louis gets injured and comes home. For good. With his best friend. Will she straighten up her act or is she still going to be the trouble maker for good?