Harry Potter: Take 2

Narcissa Malfoy wakes up one morning with future knowledge of what happens to her family a year before Draco's first year. Horrified at learning through a third party's eyes, she takes steps to escape Lucius' hold with Draco, save her son, save Harry, rescue Sirius, catch Pettigrew, & stay alive. There's just one minor detail that she's unaware of, she wasn't the only one.