Flashing lights

Krysta Teasdale. Never heard of her? Well then, you're in for a big surprise. Krysta is Lou Teasdale's adopted daughter. Only Krysta's parents and little sister lux know she exists. But, when Krysta's parents go on vacation and Krysta is left to babysit lux, what surprise is thrown at them? None other than the boys of one direction. What happens when the boys meet Krysta? What will her parents find when they come back home? What are those flashing lights in the distance?