A year after her childhood friend died in a mass methanol poisoning incident in Laos, British traveller Bethany Clarke is still grappling with grief and a lack of answers. On November 12 last year, Clarke had joined 28-year-old lawyer Simone White and another friend for a spontaneous side trip to Vang Vieng, a riverside party town popular with backpackers. After a night out at a hostel serving complimentary shots, all three fell dangerously ill. White would not survive. Six tourists died in...