Krusher start off with Prey it's suppose to be the begining of the trilogy. Though after that it seems the author jumped the gun with Hunter's Planet contradicting with War, with playing out the same scenes with different results in both novels. I suppose we can assume War being the second book and Hunter's Planet being the conclusion of the trilogy, since in HP Machiko(main character) vaguely states leaving the Predator clan to save humans, also she aged a considerate bit.