When intrepid female reporter Sydney Johnson is posted to cover an archaeological exploration up the Amazon River, the assignment seems straightforward enough. But the crew's photographer seems to be keeping some very shady company and the handsome botanist is proving to be a distraction with a difference. On a mission to find a lost Inca city and its priceless treasures, Sydney soon realises the voyage has a hidden agenda. Why is everyone behaving so sexually? Could an altogether more mysterious force be working its magic?