Flesh of the Servant

What if Peter Pettigrew was arrested at the end of Prisoner of Azkaban and the task of returning the Dark Lord to power fell to a different servant entirely? After escaping from Azkaban, it falls on Bellatrix Lestrange to successfully brew the Rudimentary Body Potion and care for her master until the time comes to restore him completely. Novel-length Bellamort; Goblet of Fire AU