Eight-year-old Tommy Beck is found dead in a wooded area. The tragic news of his son's death reached explosives expert Holger Beck at the credit bank. He and his colleagues mortgage their own homes to save their jobs. Your boss Günter Siebert, the owner of the quarry, does not have the funds for an urgently needed investment. This is the only way he can apply for a contract for the large-scale construction site of the Leipzig City Tunnel. The chief inspectors Ehrlicher and Kain initially think of a sexual offence. But then it turns out that the scene of the crime and the place where it was found are not identical. Tommy choked on construction debris produced in Siebert's quarry. However, the marks of the quarry on Tommy's clothes have been removed. And Tommy's satchel is gone too.