9780312878283 | Tor Books, September 1, 2001, cover price $27.95 |
About this edition: The Pax Comitus, rulers of Earth, send a spy into the heart of the Empyrean colonies to investigate the mysterious 'angels,' particles emitted by a nearby black hole, which the Empyreans use to ensure the ethical behavior of their officials.
9780812584189 | Reissue edition (Tor Science Fiction, September 1, 2002), cover price $7.99 |
About this edition: The Pax Comitus, rulers of Earth, send a spy, Kostas, into the heart of the Empyrean colonies, which have long resisted the power of the Pax, to investigate the mysterious 'angels,' particles emitted by a nearby black hole, which the Empyreans use to ensure the ethical behavior of their officials.
9780613670524 | Turtleback Books, December 1, 2003, cover price $18.40 |
About this edition: Angelmass, a black hole deep in space, emits "angels," small particles that render humans calm, reasonable, and virtually incapable of lying.