Illuminate the Darkness

Ginny Weasley is dead, Albus Dumbledore has been sacked, Sirius Black has escaped, there are dementors at Hogwarts, there's a new sixth year in Gryffindor, and their new Headmistress might be evil. At least Leo Black has his best friends at his side to deal with their third year together. And, what about Harry Potter? Title may change.