On Sunday night the Dr. Holger Zerban has been killed in a park near his apartment; he received a shot in the breast. Ina and Jan go to the apartment and a neighbor tells them that somebody was ringing the bell for a long time. The door of the apartment was open. His last call was to Yvonne, his wife who lives in Munich. In the morning Hajo and Miguel go to the company where Dr. Holger Zerban was working: they are received by the boss, Martin Buresch. They speak a little with him, then they surprise Mr. Robert Wenger searching something in the office of Dr. Zerban; he had in his pockets several diskettes. They also noticed that the daughter of Mr. Buresch was quite angry. Ina and Jan Maybach get the information that Yvonne has visited her husband in the afternoon before his death.
—zutterjp48