In a surprise attack that killed many of her dearest subjects, Hail Bristol, empress of Indrana, has been captured by the Shen—the most ruthless and fearsome aliens humanity has ever encountered. As she plots her escape, the centuries-long war between her captors and the Farians, their mortal enemies and Indrana's oldest allies, finally comes to a head.

When her captors reveal a shocking vision of the future, Hail must make the unexpectedly difficult decision she's been avoiding: whether to back the Shen or the Farians.