Book 3 in the Nightstalkers series. Ever since the first Rift opened in Area 51 in 1947, exposing the world to deadly beings of pure energy, only the Nightstalkers have stood between humanity and complete annihilation. But as the decades have gone by, whatever power controls the Rifts seems to be getting smarter, as if refining an ultimate plan... An old ally alerts the Nightstalkers to a resurgence of Rifts in Tennessee, near one of the team's first...