When a woman falls from a Viennese skyscraper, Inspector Brandtner and forensic pathologist Dr. Graf make a strange find in the mouths of the dead: there is a tarot card with a picture of a tower. Their investigations lead the officers from the homicide squad into the esoteric milieu. It doesn't take long for a tarot card depicting three swords to be found on another corpse. Leo Graf finds Robert Dietz with a triple stab wound that killed him instantly. What was Dietz's connection to the first victim? The trail leads to the card reader Natascha Kaminski, whose fingerprints can be found on the tarot cards. However, she steadfastly denies any guilt and puts herself in great danger, because she is also on the killers' hit list. Can Alex Brandtner prevent another murder, and will Rex succeed in arresting the perpetrator on his own?