During the battle of the department of Mysteries Harry vanishes in the time room. Travelling through time he ends up in the year 1977 on the front steps of Number 12 Grimmauld Place.
The Order ceases their fight with the Death Eaters after managing to disarm and incapacitate several of the highest ranking. Obliviated memories start to resurface in Sirius and Remus' minds giving them a not so flattering view on Albus Dumbledore and his Order of the Phoenix.
Meanwhile one of Dumbledore's spies in Voldemort's ranks reports a sighting of one Hadrian Black, Walburga Black's nephew who has not been sighted in the country for almost 16 years, at Lestrange Manor in the company of Narcissa Malfoy and Severus Snape. fuck