Harry's Unknown Power (A Father and Son fanfic) Book 2

A house elf named Dobby appears in his room at Spinner's End, where he is living for the summer with his father Severus Snape. Dobby warns him not to return to Hogwarts, but Harry returns to Hogwarts, despite Dobby's warning. Muggle-born students start turning into stone after Harry hears a mysterious voice that only he can hear. What does Dobby know? What is turning the students to stone? Why can only he hear the voice? Read on to find out!!