Gallagher Girls: Out of Sight, Out of Time by Ally Carter (author)

Normal. I liked the sound of that. Sure, as the daughter of two secret agents, I didn’t really know what normal meant, but that didn’t matter. Normal was my new mission. Cammie wakes up in an Alpine convent having lost her memory of the whole summer. She and her friends must travel to the other side of the world, trying to piece together the clues that Cammie left behind. But there are people hunting Cammie – people who will stop at nothing to protect their secrets …