When the zombie apocalypse turns the whole world upside down, it also twists the fate of two people who thought they'd never be able to work together. Now, forced by their situation to grow beyond their past, those who were once defined by their mutual enmity will become united in their experiences and the hope of saving everything they care about before it is too late.

Third year brings new troubles to Hogwarts, but none more than Harry Potter with the breakout the Dark Lord's right hand man, Sirius Black. Determined to finish what his master failed, Harry is sent back to the Dursleys where he can be safe within the blood wards and not allowed to visit the Weasleys at all nor contact his friends. To make sure of this, Hedwig is forbidden from being taken back to the Dursleys, yet after Sirius is sighted near Privet Drive, Professor Snape is forced to take control of Harry as an apprentice. However, when Snape arrives at Privet Drive, he discovers that Potter is missing. Is it Black that kidnapped him? Is it someone or something else more sinister? Harry is found in an unlikely place and taken away, forbidden from contact with his friends as he is thrust into the role of apprentice. Yet amidst these troubles, Harry discovers something about himself and a hidden crime that only a murderer and his best friends know, something that may change Harry's future for the better...or the worse.