Among the tangled waterways and giant anacondas of the Brazilian Rio Negro, an enigmatic scientist is developing a drug that could alter the lives of women for ever. But Dr Annick Swenson's work is shrouded in myster, especially from her investors. When Anders Eckman, a mild-mannered lab researcher, is sent to investigate, a curt letter reporting his death is all that returns. Now Marina Singh, Anders' colleague and former student of Dr Swenson, must retrace her friend's perilous steps. Little does she know that she will face challenges beyond her wildest imagination.