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In 16th-century Madrid, a crypto-Jew with a talent for casting spells tries to steer clear of the Inquisition. Luzia Cotado, a scullion and an orphan, has secrets to keep: “It was a game she and her mother had played, saying one thing and thinking another, the bits and pieces of Hebrew handed down like chipped plates.” Also handed down are “refranes”—proverbs—in “not quite Spanish, just as Luzia was not quite Spanish.” When Luzia sings the refranes, they take on power. “Aboltar cazal, aboltar mazal” (“A change of scene, a change of fortune”) can mend a torn gown or turn burnt bread into a perfect loaf; “Quien no risica, no rosica” (“Whoever doesn’t laugh, doesn’t bloom”) can summon a riot of foliage in the depths of winter. The Inquisition hangs over the story like Chekhov’s famous gun on the wall. When Luzia’s employer catches her using magic, the ambitions of both mistress and servant catapult her into fame and danger. A new, even more ambitious patron instructs his supernatural servant, Guillén Santángel, to train Luzia for a magical contest. Santángel, not Luzia, is the familiar of the title; he has been tricked into trading his freedom and luck to his master’s family in exchange for something he no longer craves but can’t give up. The novel comes up against an issue common in fantasy fiction: Why don’t the characters just use their magic to solve all their problems? Bardugo has clearly given it some thought, but her solutions aren’t quite convincing, especially toward the end of the book. These small faults would be harder to forgive if she weren’t such a beautiful writer. Part fairy tale, part political thriller, part romance, the novel unfolds like a winter tree bursting into unnatural bloom in response to one of Luzia’s refranes, as she and Santángel learn about power, trust, betrayal, and love. Lush, gorgeous, precise language and propulsive plotting sweep readers into a story as intelligent as it is atmospheric. Copyright © Kirkus Reviews, used with permission.