The Twin Dilemma

My twin's just stolen my life. Armed with my luggage, money and passport, Jen's ran away to the airport and it's too late to catch her. Now her boyfriend's turned up and - guess what? - he thinks I'm Jen!I could protest. I could stay in my lonely flat and sulk while my sister lives it up in Las Vegas for the next few weeks. Or maybe I could use this situation to my advantage. My name is Sara. My twin's just stolen my life.
Now it's payback time.