The mafia killer Ante Dedic pursues Peter Schmidt and his son Robert to kill them, because Schmidt testified against the mafia years ago. After a first attack in which Peter is seriously injured and Robert is almost unharmed, Dedic plans another murder attempt in the hospital, which Tom and Semir are just able to prevent. Robert is brought to safety, but danger threatens here too. The investigations by the highway commissioners reveal that Schmidt had been given a new identity by the BKA - which suggests that someone from the ranks of the BKA has betrayed the cover.