An Opus Alchymicum Vol 4: The Dæmon's Crucible

Third Year dawns. As Voldemort and the Magisterium move to take total control of Dust, Dæmons and Magic, a mass-murderer from Neville's past is sent to kill Lyra, Dementors arrive to guard Hogwarts, and Harry & Hermione face a perilous journey from world to world, to save Sirius and Baby Seren from certain death, and to thwart yet another threat to their incredible destiny.