"Welcome to Tiankawi - shining pearl of human civilization and a safe haven for those fleeing civil unrest. Or at least, that's how it first appears. But in the semi-flooded city, humans are, quite literally, on top: peering down from shining towers and aerial walkways on the fathomfolk - sirens, seawitches, kelpies and kappas - who live in the polluted waters below. For half-siren Mira, promotion to captain of the border guard means an opportunity...

"A cunning and impetuous scout, Alix only wishes to serve quietly on the edges of the action. But when the king is betrayed by his own brother and left to die at the hands of attacking Oridian forces, she winds up single-handedly saving her sovereign. Suddenly, she is head of the king's personal guard, an honor made all the more dubious by the king's exile from his own court. Surrounded by enemies, Alix must help him reclaim his crown, all the while...