The Demon’s Lexicon by Sarah Rees Brennan

Power always has a price — and demons never forget a debt.

Nick and his brother Alan have spent their lives running from the magicians who murdered their father and marked their mother for death. But when a desperate girl seeks their help, the brothers are drawn into a dangerous web of secrets, betrayal, and forbidden power.

As loyalties shift and the truth unravels, Nick must face the darkness within himself — and decide whether he can fight the very magic that threatens to consume him.

Fast-paced, suspenseful, and emotionally gripping, The Demon’s Lexicon blends urban fantasy and psychological depth in a story about love, fear, and what it means to be human.