Dr Michael Reidinger, the renowned chief physician of the Marien Hospital in Regensburg, has disappeared. His father Horst Reidinger accidentally bumps into Inspector Lucas, who takes on the case. When Reidinger's car is found openly under a railway bridge, the team works flat out to find the missing man, but initially without success. Shortly thereafter, Ellen Lucas finds Horst Reidinger critically injured in his homeson. Ellen Lucas senses that there must be more behind Reidinger's disappearance and quickly finds it, because against Dr. Reidinger and the clinic had filed a class action lawsuit from a patient initiative for non-compliance with hygiene standards. hospital manager dr. Lindner rejects any guilt. Judge Gerhard Huber, who rejected the lawsuit, also remains silent, saying that there is no evidence of a hygiene deficit in the hospital.