Tatort S2013E21 - Saalfeld - 17 - Die Wahrheit stirbt zuerst

In the early hours of the morning, chief inspectors Eva Saalfeld and Andreas Keppler were called to a lake in the forest. A seven-year-old girl was found dead on a boat. Her mother Paula Albrecht is desperate. She suspects her husband Peter, from whom she has been separated for some time. Amelie has been with him for the past few days. Paula fears that he has murdered their daughter because he could not bear that she is about to move to Cairo with Amelie and her new partner, Johannes Bittner. Shortly thereafter, Amelie's father is found near the crime scene. He cut his wrists. Everything indicates that Peter Albrecht first killed his daughter and then wanted to kill himself. Eva Saalfeld tries to save him with a blood donation.
The autopsy found that Amelie suffered from asthma and that she died from suffocation. When Keppler finds a full asthma spray in the glove compartment of Albrecht's car, the question arises as to whether Peter Albrecht intentionally withheld the much-needed medicine from his child. Surprisingly, a colleague from the BKA contacted Keppler and demanded administrative assistance. Spicy: Linda Groner is an ex-girlfriend of Keppler. She wants to be involved in the investigation because Johannes Bittner has been under surveillance by the Federal Criminal Police Office for some time because of illegal foreign transactions. The shell necklace that lay with the murdered Amelie bears his fingerprints. The assumption is that the child stood in the way of his future plans with Paula in Egypt.
The persistent search for the truth, in which they are repeatedly interrupted by Linda Groner, finally leads the detectives to the perpetrator.