The Flock has unleashed a wave of targeted attacks on research facilities across Earth and the terraformed areas of Mars. But are they the enemy or one of Claire's few potential allies in saving Earth? Her only clue is the ancient, cryptic journal left behind by alien rebel Eberin Das of the Ufretan Alliance who tried-and failed-to save Mars from his own people. Claire has a partial translation, thanks to Beck, but can she truly trust him now that she knows he's not only an alien, but a member of that very same Alliance?