A Thousand Words for Stranger

A Thousand Words for Stranger opens with a Prelude, in which two Enforcers are following a Clansman and Clanswoman -- the Enforcers are the police of the Trade Pact between various planets, but the Clan (a group of humanoids with powerful mental abilities) aren't part of that Pact. Then the Clanspeople are attacked, and the woman wanders off on her own. In Chapter 1, we find out that this woman is Sira, who is mindblocked and has no memories, only strange compulsions which govern her behaviour.