Adrian is a talented and ambitious young actor. On the way to an important casting in Munich - he is supposed to audition for a leading role - he is involved in an accident. But that is not all: a policeman wants to arrest him, a beautiful, mysterious woman puts him in chains and in a lonely mountain village he is suspected of murder. Adrian has the feeling that everyone around him is crazy.
Karl and Paula work as specialist divers in Vienna, while their former friend Fred runs a diving school in Croatia. While surveying Vienna's underground, Karl and Paula come across a system of catacombs in which they discover valuable burial objects and a mummified corpse with numerous tattoos. When Karl has an accident during his explorations, Fred is asked for help by Paula. Neither of them suspect what they will soon be involved in.
Several emblematic buildings in Vienna suffer from a series of explosions that destroy works of art of inestimable value, as well as generating a large number of victims. Detective Peter Bender will need the help of Lena, a student of art, discover the murderer, because it uses a hidden code in the symbolism of the boxes to convey a message.
