Synopsis: Author's description: Katelin and Calum both 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. Racing to the rescue, the children encounter a sinister plot to exploit the rainforest's legendary black orchid. In a pursuit against time to find the skull and save the orchids, Katelin and Calum are swept into a dangerous world of spiritual beings, pink dolphins and a mysterious tribe of female warriors who are protecting biblical artifacts.