Land of the Blind - Jess Walter

An elegiac thriller about a middle-aged man who wants Spokane police detective Caroline Mabry to witness his confession to a crime that hasn't yet been discovered. As Clark Mason writes the long story of a childhood friendship gone horribly wrong, readers will shudder, remembering their own tortured adolescence and revisiting it in that of Eli Boyle, whose physical and social awkwardness made him a natural target for his peers.

Back then, even Clark joined the crowd in making fun of Eli. But he also showed him some kindness--enough to make Eli agree to let Clark turn his fantasy game, Empire, into a high-tech start-up years later, and to bankroll Clark's run for Congress. But when the technology boom goes bust and Clark's dreams run out of steam, Eli makes a last, frightening bid for what he's always wanted--revenge on those who made his childhood hell, including the woman Clark has loved since high school.