Disciple — Walter Mosley

Hogarth “Trent” Tryman is a forty-two-year-old man working a dead-end data entry job. Though he lives alone and has no real friends besides his mother, he's grown quite content in his quiet life, burning away time with television, the internet, and video games. That all changes the night he receives a bizarre instant message on his computer from a man who calls himself Bron. At first he thinks it's a joke, but in just a matter of days Hogarth Tryman goes from a data-entry clerk to the head of a corporation. His fate is now in very powerful hands as he realizes he has become a pawn in a much larger game with unimaginable stakes -- a battle that threatens the prime life force on Earth.