The Boomslang Thief and the Best Revenge

This is a sequel to The Boomslang Thief, and another murder mystery.  When someone of import is found murdered, all eyes again go to Harry Potter, the last person to see her alive.  Will Snape be able to clear his name this time?  How does Harry cope with the revenge he wants to take?  Warnings:  AU, spanking (cp) of teenagers, death of a major character.