Amber Dawson is the daughter of an impoverished nobleman, who has long resigned herself to the fate of an old maid. Her life is boring and measured, and her father and stepmother place all their hopes on the youngest, the beautiful Lucy. Duke Amstel is the highest dragon. He is rich and influential, his past keeps many secrets. One fateful night, one loss at cards - and Lucy’s fate is decided, and the contract, according to ancient customs, is signed in blood. Will Amber be able to defeat the dragon and save her sister? And how will this game turn out for her?