Nightshade

"After two hectic years at Rosenholm Academy, Chamomile, Kirstine, Victoria, and Malou have found out who killed the former student Trine back in the 1980s and banished her to an existence as a white shadow. But the mystery and intrigue isn't over yet. The girls want to expose the killer and make him confess his crime. However, it soon dawns on them that the darkness at Rosenholm runs much deeper than they first thought, and none of them feel safe. Bit by bit. they must now solve the riddle that rests deep in the school's walls. Before it's too late"--