He Did Not Summon The Death Eaters

This story takes place in December of 1981, three months after Severus Snape started teaching at Hogwarts and less than two months after Voldemort's attack on Godric's Hollow. Snape is unjustly accused of participating in a Death Eater attack on Hogwarts, and then promptly shut in the dungeons by the other irate teachers. McGonagall embarks on a quest to find him innocent.