Lord Voldemort is dead and as the wizarding world attempts to cope with the fallout a power vacuum has formed. Ex-Deatheaters deal for their lives in backs street alley ways as political games are played in the Ministry. Meanwhile Mia Wilde is returning for her sixth year at Hogwarts and an ancient power not seen in Britain for hundreds of years is beginning to awaken.

The world has changed since Harry defeated Voldemort. James and Rosie are returning to Hogwarts for their 6th year, but someone else who threatens the entire muggle and wizarding world is returning with them.