When Jack is summoned into the mortal world by a spell that goes wrong, he figures he’ll see why all the demons down below rave about London. Despite his horns, pointed ears, and a few more noticeable “attributes,” he slides seamlessly through a human city teeming with filth, corruption, and vice.

London is all any demon could want, especially with such a plentiful food supply. Tasty little morsels practically throw themselves into Jack’s arms, only to realize too late that they’ve made a mistake—until Polly lands in his lap and changes everything.

Jack’s not sure what happened. One minute, he was dining on a plump specimen and picking up a charming young lady for dessert, and the next—Polly was sweeping his attic flat, scrubbing his floors, and off to the market to do his shopping. Full enough to watch and wait, Jack finds that Polly feeds something else—his curiosity. While the rest of London watches in (warranted) terror for sightings of the so-called “Spring-Heeled Jack,” Polly is busy touting him as a hero. Shockingly, Jack thinks she may even be falling in love with him.

Love? That’s something neither Polly nor Jack have ever experienced first-hand. Is it really as simple as being unable to imagine your life without the other person? Can it really change your entire life? Polly seems to think so, and Jack? Well, he doesn’t know what to think. Good thing he has Polly—his guide to London, love, and being a hero.