Volume One [Magic Stone]
Volume 2 [Secret Room]
Volume 25 [Rampage Holiday]
The mysterious Three Musketeers of the Ministry of Magic, the unknown prophet
Hesitant third-party forces
The old centaur groping for the darkness, the ambiguous Gringotts
The entry of the windmill slowly turns the magic wheel
Neville's strength surges and Malfoy changes drastically
Someone once said:
Dark night is coming, always be vigilant!
Everything is in Volume 3 [Eve of Darkness]