An Opus Alchymicum Vol 4: The Dæmon's Crucible

Hogwarts Third Year dawns for Harry and Hermione, and as Voldemort and his Magisterium move to take total control of Dust, Dæmons and Magic, a murderer from Neville's past is sent to kill Lyra. As dangers rise, a great flood separates James and Lily from Harry's infant sister. Harry and Hermione must race to rescue her, but the Dark Materials following them are never far behind.