Zero Hour is the sixth book in the H.I.V.E. series and was release on the sixth of September 2010
Overlord is reborn and has developed a chilling abitlity to move from body to body, erasing the hosts personality and eventually killing them, forcing to mover from victim to victim.
Nero also knows that Otto cannot fall into Overlord's hands and a race across the globe begins.
The stage is set for the final battle with Ovelord, little do they know that Overlord has weapon in his arsenal unlike anything they have ever seen before.....
Overlord has developed the power to move from body to body. New machines have been developed but the first glimpse to the public brings terror as Overlord takes control of the facility (an Advanced Weapons facility in Colorado). He uses self-replicating Nanites which, if released will cause everyone to be a slave of Overlord. Then Raven is exposed to Animus. The four, along with Lucy , Nigel , Franz , Nero and Prof. Pike flee to the Megalodon, a mega submarine that belongs to Darkdoom . The battle is nearing the end, and The Disciples, followers of Overlord, are winning. Nero and Darkdoom must call into action their final effort - Zero Hour, in a desperate battle to the death. Zero Hour involves all the most successful ex-Alphas, each out-fitted with brand-new machinery and gadgets. They have to fight, and Lucy ends up dying, in a sacrifice for Otto. She tells him, "There always has to be a choice." The heroes survive, and it is obvious that Overlord is no more, but the organization that supports him is still very much there (the Disciples). Nero disbands the ruling council of G.L.O.V.E. , telling them that they are a part of a "By-gone era".
(From the Wikipedia page)