The Seventh Book by Duoqing Jianke Wu

This is the story of a retired Auror from the Ministry of Magic who returns to Hogwarts to teach.

When darkness strikes again, he has no choice but to set out on the path to becoming the third Dark Lord.

Voldemort has been resurrected, and Grindelwald has returned to his former glory.

Who will ultimately take control of the British wizarding world?