After a close call with an assassin in Barcelona, Danny is more convinced than ever that his parents-star performers in the Mysterium circus-died under suspicious circumstances. He's also sure that there's a traitor within the Mysterium. As the troupe heads to Berlin for a circus festival, Danny scrambles to unravel the clues his father left behind. He'll need his decoding skills-plus some extremely risky circus tricks-to find out what really happened to his parents and who's still trying to sabotage the Mysterium. Can he expose his parents' killer before disaster strikes again?