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?