Harry Potter. The Chamber of Secrets

"Harry Potter receives an ominous warning from a house-elf at Hogwarts School of Witchcraft and Wizardry: if he urns to the school at the end of the summer, terrible things will happen. But return Harry must.
His second year begins with a new Defence Against the Dark Arts teacher, Quidditch training and the intensification of old rivalries. Then the warning starts to ring true, as mysterious words are daubed on a wall, students are attacked and Ron's sister, Ginny, disappears. And so the search for Saiazar Slytherin's heir begins, with the mystery pointing Harry to a clandestine chamber and a deadly creature at its heart..."