Draco Sinister

Draco Sinister is the second installment of The Draco Trilogy by Cassandra Claire. Since it was written before Harry Potter and the Order of the Phoenix and set after it, it is now an alternate universe fic. It was very influential in the early days of the fandom, but became controversial when it was found that parts of it were plagiarized.
It follows Draco Dormiens and was followed by Draco Veritas.