East meets West; past meets present; criminal minds meet skilled artists - welcome to the Mysterium, a circus with dark and thrilling secrets at its heart. Twelve-year-old Danny Woo is half-Chinese, half-British. His parents are performers in the Mysterium. Following their death in a mysterious fire, Danny is sent to live with his aunt Laura, an investigative journalist. When Danny's school is closed after an explosion, he joins Laura on a trip to Hong Kong. She is researching the Triad gangs; he is trying to understand more about his cultural background. But Laura disappears, and Danny is plunged into a dangerous quest to find her - which opens the door on the past he could never have imagined, and which leads him to question everything he has ever known about his past.

Danny Woo has escaped from the jaws of death once - but his trials are not yet over. He's meant to be recovering, but when he discovers the Mysterium - the circus into which he was born, and which cost his parents their lives - is being reformed in Barcelona, he determines to join them. But all is not well - who is the bad seed inside the once-loyal company? And who is the woman in green who can kill, and who seems to be trailing Danny with each move he makes? Everything, he knows, is linked to the death of his he must continue his quest to find his parents' killers. Once again, the story culminates in Danny's participation in a well-known and dangerous stunt.

Die turbulenten Ereignisse in Barcelona haben den Zirkus Mysterium ordentlich ins Wanken gebracht. Die Kompanie bricht daher die Zelte ab und zieht nach Berlin weiter. Für Danny gleicht diese Reise einer Verabredung mit dem Schicksal, schließlich fanden seine Eltern dort ihr tragisches Ende. Das Wiedersehen mit der deutschen Hauptstadt reißt alte Wunden auf, aber Danny gibt nicht auf, sondern lässt sich nicht von seiner Suche nach dem vermeintlichen Maulwurf in der Truppe abbringen. Nur einen letzten Schlüssel zur Lösung gilt es noch zu finden, während sich ein dunkler Schatten über den gesamten Zirkus legt. Julian Sedgwick sorgt mit dem atemberaubenden Finale seiner MYSTERIUM-Trilogie dafür, dass seinen Lesern das Blut in den Adern gefriert.