The Bone Shard Daughter builds an empire on two unforgettable hooks: islands that can sink beneath their citizens without warning, and a magic powered by chips of bone cut from those citizens’ skulls. Every child in the Phoenix Empire is tithed a shard; every shard animates a construct; every construct burns through the life it was cut from.

Stewart keeps the premise human by showing the same system from the palace, the streets, a rebel household and an island of people with stolen memories.

Stewart keeps the premise human by showing the same system from the palace, the streets, a rebel household and an island of people with stolen memories. The imperial magic reads differently depending on who is describing it, which is the whole argument.

Lin and Jovis carry the book. Lin’s search for her father’s keys turns the palace into a locked-room puzzle with a memory she cannot trust; Jovis, hunting the wife who vanished seven years ago, supplies the warmth and the road — and Mephi, the small impossible creature he fishes out of the sea, is the most purely likeable thing in the series.

Several explanations are withheld until very late, and the middle asks patience of readers who want their mysteries paid on time.

The payoff justifies it: the revelations about Lin, Sand, Nisong and Emahla reorganize nearly every relationship in the book without making the earlier chapters feel like sleight of hand. And the final beat — Lin on a throne she may not be entitled to, Jovis seeing his missing wife in her eyes — is a superb hook into book two.