The Legends, Katelin and Calum, embark on another fantastic adventure when dolphins call them deep into the Amazon rainforest. An archaeologist unaware of its catastrophic powers has stolen a crystal skull; also the children have discovered a sinister conspiracy to exploit the rainforest’s legendary black orchid. In a pursuit against time to find the skull and save the orchids, Calum is helped by a young mysterious girl. After getting lost, the children come upon the family of the young girl, a mythical tribe of female warriors, who are protecting biblical artefacts and they ask the children to help retrieve two more crystal skulls. Promising to return later, the children race off to save the extinction of the black orchid and are swept into a dangerous world of commercial greed.