Blueheart is at a crucial point in it's history - the adaptive humans who have colonised the planet covered in the main by ocean are at the limit of their usefulness and the debate on the desirability of further terraforming is becoming heated. The discovery of a corpse deep beneath the sea is not too unusual - there are natural predators in these seas as there are in any ocean - but for Rache and Daven who discover her, this adaptive, genetically engineered to survive in Blueheart's seas, is the catylyst for a tragedy of global proportions.