The investigation into a murder case has been going on for three months. A man was killed with three knife stabs in the abdomen in front of the entrance to an apartment building. The perpetrator disappeared undetected and without a trace in the night. There is no evidence of a conclusive motive for killing. Chief Inspector Henry Koitzsch and Inspector Michael Lehmann have so far unsuccessfully investigated the murder of Uwe Baude. Now the evaluation of a cell phone monitoring should bring new testimony. An intensive questioning begins of those people who were using their mobile phones in the vicinity of the crime scene at the time of the crime. Although nobody hadn't seen anything at first, the individual pieces of the puzzle slowly create a picture of the night of the crime.

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