chunk: More attempts are made on Ms Stangerson's life despite Rouletabille and Larsan's protection, and the perpetrator appears to vanish on two occasions when they are closing in on him, echoing Professor's Stangerson's research into "matter dissociation". The game-keeper is murdered during the second attempt. Ultimately, Larsan arrests Darzac who is charged with murder attempts. Rouletabille suspects that Darzac has secret reasons not to defend himself and he disappears to make further investigations.