Glasshouse [Stross, Charles]

When Robin wakes up in a clinic with most of his memories missing, it doesn't take him long to discover that someone is trying to kill him. It's the twenty-seventh century, when interstellar travel is by teleport gate and conflicts are fought by network worms that censor refugees' personalities--including Robin's earlier self.

On the run from a ruthless pursuer and searching for a place to hide, he volunteers to participate in a unique experimental polity: the Glasshouse, a simulated pre-accelerated culture where participants are assigned anonymized identities. But what looks like the perfect sanctuary turns into a trap, placing Robin at the mercy of the experimenters--and at the mercy of his own unbalanced psyche...