(The challenge, of course — in addition to being brief — will be to not include any spoilers!)
This blog post covers only the first third of the novel, which is subtitled simply ...
Apocalypse starts with the end of Planet Earth as we know it. NASA and other space agencies have been tracking large, civilization-threatening asteroids (near-earth objects, or NEOs) for some time. One which briefly caused them concern as a potential existential threat, way back in December of 2004 when it was first discovered and calculations showed it might come perilously close to striking the earth in 2029, was 99942 Apophis. But further orbital dynamics measurements and observations quickly determined the threat from Apophis was minimal, that it would miss earth in 2029 by a comfortably large margin.
That all changes on September 11, 2027, when "something" (or someone) unseen provides an explosive nudge to Apophis, way out in the asteroid belt as it is inbound toward Earth ... and its chance of striking our planet suddenly changes to 100%. Its new course has the civilization killer striking us dead-center on April 13, 2029, and the world has only six short months to do something about it ... and also, to deal with the unseen enemy who apparently wants us dead.
Apocalypse follows this story through the lives of three very distinct individuals, who are dealing with the coming catastrophe in far different ways, and who will ultimately be brought together under the most unlikely of circumstances:
Mitchell Feofan is an American astronaut, of Russian descent, who is working on the International Space Station with the Orion interplanetary exploration program when sudden preparations for an urgent voyage to intercept Apophis (and to "deal with" the adversary who nudged it) are drawn up. He leads the three-person, one-way mission into the unknown, which is humanity's only hope for surviving the catastrophe. His ship, the Orion-class USS Menelvagor, is loaded to the hilt with the most lethal weapons ever devised by humankind, in hopes of stopping the fate coming at earth like a titanic steamroller.
And of course, in addition to dealing with the more skin-crawling aspects of their deadly payload, Feofan also has to put up with the antics of Rigel, their onboard artificial intelligence.
Fadi Tanzilur is, in almost every respect, Feofan's antithesis. He is a Middle Easterner who has been cultivated by terrorists to stop the European Space Agency (ESA) from completing its mission to deflect Apophis. The organization he represents believes the apocalypse must happen first in order for a new civilization to be rebuilt under Sharia Law. And Tanzilur and his accomplices are in position to execute their bombing of ESA headquarters in Darmstadt, Germany, when something truly extraordinary begins to shake the foundations of his life and cause him to dramatically change direction.
And then there is Ukwambulu Liyana, who lives in a world far apart from the struggles either to stop Apophis or profit from the disaster it brings. An impoverished victim of abusive power, she has risen above her own disempowerment and now works to help HIV-afflicted women living in a shantytown in Durban, South Africa. Along with an Anglican priest who changes her life forever, she finds herself on the day of disaster on the beach which is closest to the asteroid's projected point of impact in the Indian Ocean. There she catches a glimpse of a key role that she will play in the unveiling of a new era for humanity.