Night after night, the nineteen-year-old emperor wakes in terror. Only a wordless lullaby in her arms can soothe him to sleep.
He is Yin Heng, the youngest emperor of the Dayan Dynasty. In the year since he ascended the throne, he has killed over a hundred people, earning the court officials’ nickname for him: "Little King of Hell."
She is Shen Tanyin, the Grand Princess of Dayan, the late emperor’s adopted daughter, and his elder sister, though they are not related by blood.
She protects him because the child who spent an entire night freezing in the corridor of the Cold Palace at the age of six should not have to be abandoned by the world again.
But what he longs for now is far more than that comfort.
As possessiveness tears away the veil of their sibling bond, and court intrigue pushes their forbidden feelings into the spotlight, she must choose:
Will she continue to be his rightful "Imperial Sister," or admit the answer she dare not face?
And he must let go of the power he clutches so tightly before he can truly take her hand.
