Set in the Spanish Golden Age, during a time of high‑stakes political intrigue and glittering wealth, The Familiar follows Luzia, a servant in the household of an impoverished Spanish nobleman who reveals a talent for little miracles. Her social‑climbing mistress demands Luzia use her gifts to win over Madrid’s most powerful players but what begins as simple amusement takes a dangerous turn. Luzia will need to use every bit of her wit and will to survive—even the help of Guillén Santángel, an immortal familiar whose own secrets could prove deadly for them both.