Summary Bomb alert on Lake Constance. An unexploded bomb from the Second World War has washed up and must be rendered harmless. Under the command of Matthias Krämer, the defusing of the dangerous anchor mine begins. Paul is also on site. He and his friend Matthias know each other from their time together in Afghanistan, where they were involved in setting up the local police force. The young explosives expert Sven Sailer is to defuse the mine. Matthias, Paul and Sven's colleagues Alexandra Schulz and Hadi Bozkurt remain connected to the young man via radio and GoPro video transmission. When Sven takes a closer look at the mine, the unthinkable happens: It explodes. Sven has no chance. His death is a shock for everyone. A tragic accident? But then Paul and the forensic team find evidence that the apparent industrial accident was an assassination attempt: someone deliberately detonated the mine remotely using modern explosives. When Julia brings the news to Sven's wife Steffi, the pregnant woman collapses. Nele and Paul discover that the explosives come from the weapons depot of the bomb disposal service in Friedrichshafen. When Paul confronts Matthias, who is responsible for the depot, he admits that 40 kilos of explosives and 15 high-precision detonators were recently stolen from the depot. Is the thief also responsible for Sven's death? And who is the mysterious Afghan woman with whom Paul apparently has a very personal history and who now urgently needs his help?

• Crime