Sin eater's daughter (Scholastic)

Seventeen-year-old Twylla lives in the castle. But although she's engaged to the prince, Twylla isn't exactly a member of the court. She's the executioner. As the Goddess embodied, Twylla instantly kills anyone she touches. Each month she's taken to the prison and forced to lay her hands on those accused of treason. No one will ever love a girl with murder in her veins. Even the prince, whose royal blood supposedly makes him immune to Twylla's fatal touch, avoids her company. But then a new guard arrives, a boy whose easy smile belies his deadly swordsmanship. And unlike the others, he's able to look past Twylla's executioner robes and see the girl, not the Goddess. Yet Twylla's been promised to the prince, and knows what happens to people who cross the queen. However, a treasonous secret is the least of Twylla's problems. The queen has a plan to destroy her enemies, a plan that requires a stomach-churning, unthinkable sacrifice. Will Twylla do what it takes to protect her kingdom? Or will she abandon her duty in favor of a doomed love?