Once Upon A Demon's Heart by K.M. Moronova

Some hearts aren't meant to be saved. They're meant to be claimed. Once Upon A Demon's Heart is a dark, irresistible fantasy from K.M. Moronova — the indie sensation behind Bulletproof and the Blade & Blood series — now published with Penguin Cornerstone. Wicked, atmospheric, and utterly consuming, this is the demon romance that will make you root for the villain, fall for the darkness, and forget everything you thought you knew about fairy tales.

Format: Paperback | Publisher: Penguin (Cornerstone) | Pages: 358 | Published: 25 June 2026

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