Auzou Book for the ghost smuggler volume 3 the haunting castle

When Malo travels to visit his Scottish correspondent Arthur, he doesn't expect to find himself in a haunted castle! It's a great opportunity for the ghost guide and the brave Octave who is accompanying him. The holidays start off well! However, as soon as they arrive, the ghosts of the old building begin to disappear one by one... When Octave falls victim to this strange phenomenon, Malo and Arthur have no choice but to call Silène for help: who is after the ghosts?