Meet the Becky Sharp and Moll Flanders of the Wizarding World. Plucky and cunning, Bridget O'Brien is a Muggleborn who served Voldemort and a Ravenclaw prone to self-destruction, a Dumbledore's Army member who tried to flee to France in an act of cowardice...until she was caught by Snatchers and left to rot at Malfoy Manor. Until, of course, she thrived.
1967-1970. Chronicles the middle age of Voldemort and the early years of his future mistress Bellatrix Black Lestrange, who fell obsessively in love with him as soon as they met. Not a lemon fic, just full of generally disturbing themes.