The manager of a medical-nuclear laboratory, Dr. Thomas Jordan, has been irradiated because of a sabotage in the laboratory: a container with radioactive materials exploded and soon he will die. When Hajo arrives with his team, Dr. Thomas Jordan presents them Mathias Draber and Peter Sawatzki, his associate. The laboratory is surveyed by firemen with cameras and the firemen found a leaf of maple. As Dr. Thomas can't drive a car, Ina will be in charge of Dr. Thomas Jordan who first go to the bank, then to his house where he meets his wife Helena and give her some money. Then he goes to an asylum where he meets his ex wife Edith and gives some donation to the personal of the asylum. Finally he tries to join his daughter Imke, who doesn't want to open the door, but he left a message. In their investigation Hajo and Jan discover that Mathias Draber made a contract with an American firm without speaking about it with Dr. Thomas: besides every associate has a decorative maple tree. About his alibi, Draber said that he went o the Havana till 11 pm and then he went home. Peter Sawatzki affirms that he spent the night at home, but some telephone records show that he was speaking with Helena, Dr. Thomas Jordan's wife.
—zutterjp48