Mattheo Riddle never expected to become the guardian of his 4-year-old sister, Evangeline, when their parents leave her at Hogwarts for “family business.” Now a sixth year at Slytherin, he’s suddenly juggling school, teenage drama, and a small child who has fully adopted the Slytherin common room as her home. With Theodore, Blaise, Lorenzo, and Draco reluctantly stepping into “uncle” roles, Evangeline quickly turns Slytherin House into something it never planned to be—slightly softer, a lot louder, and completely wrapped around her tiny finger.