Underworld - S.D Perry

Umbrella has secrets. The mysterious corporation is creating monstrous biological killing machines for the highest bidder. But Umbrella has enemies too, chief among them a contingent of rogue S.T.A.R.S, former members of the paramilitary response unit Umbrella helped to create.
Despite its vast power, Umbrella has begun to loose control of its hidden research facilities, bit by bit, one lab at a time. Three labs have already been destroyed. But beneath the deserts of the American Southwest, one of the company's most elaborate facilities is about to go online. Somewhere inside may also be the key to stopping Umbrella once and for all...if Leon Kennedy, Claire Redfield, Rebecca Chambers, and their friends can get past a strike team of corrupt S.T.A.R.S and survive the genetically engineered horrors awaiting them below the sun-scorched earth. Umbrella has secrets, and one man with an agenda of his own knows them all...