I'm here because his defense lawyer thinks I will understand Reiser. The accused is a 43-year-old geek — he lives in his own world of computer code, videogames, and science fiction books. He spent his early twenties developing a role-playing game to compete with Dungeons & Dragons while writing a novel about aliens invading Earth. By age 30, he'd decided that his talents would be better applied to recrafting overlooked aspects of the Linux operating system. As a technology writer, I frequently meet people like this. Just because he doesn't behave like the rest of us — and just because he evaded police surveillance and bought a book titled Masterpieces of Murder shortly after his wife's disappearance — doesn't mean he's guilty. I have been asked to try to understand this, to try to understand the man.