At Zak White's family home you don't have to look far to spot a photo of his older sister, Simone. There are shots of graduations, holidays - typical reminders of special moments and milestones. Simone's passion, though, was seeing the world. Late last year, she headed out on what was supposed to be the trip of a lifetime, backpacking with mates in Laos, South East Asia. "She was really excited because she was going out there to meet up with her friend Bethany [Clarke], who she hadn't seen for