It was only 50 days, she would tell herself. It can't be that bad right? Well it was. Sadie Burns was your typical bad girl. Leather jacket, combat boots, and different colored hair every 2 weeks. She hated pop music and hated boy bands even more. So, how did she get stuck making a bet with Kendall Schmidt? His side was that he could make her fall for him and like their music. Her side was that she wouldn't fall for him, and if so, they would get out of her life. She hates him but he adores her. Sadie is sure she is going to win, Kendall's not so sure. Could he break her bad girl reputation? Could Sadie get this boy band blondie out of her life? The biggest question is, after 50 days with Big Time Rush, who's going to win?

Kendall was only seven when his little sister was born. She was given up for adoption and he never heard anything about her until now. Both of his parents are dead so it becomes his sole responsibility to take care of her. But his life is crazy because he's touring with Big Time Rush and she is a lot more damaged than he ever expected.