"It started with rumours and numbers that didn’t add up," writes Annabel Symington, Nepal bureau chief on how she began work that eventually led to uncovering a massive helicopter rescue scam in the lucrative tourist industry in the Himalayas.

"It led to hours scanning reviews on TripAdvisor and weeks hiking around Mount Everest. But when I started looking into insurance fraud linked to helicopter rescues in Nepal, I didn’t think it would end with a government probe and an ultimatum from global insurers that could be a death knell for the Himalayan nation’s vital tourism industry."