For Sarai and Nicholas Grimm, life is simple: find the monsters, beat the monsters, take the money, frosty chocolate milkshakes and boring old research books for all. But one night, one favour to a friend has set them on a path neither can predict. An attempt at a selfless act has them branded outlaws, hunted by an old rival, and trying to understand just what is happening alongside their personal hero. What awaits them is the beginning of an adventure neither of them are prepared for.