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Christiane Hörbiger, Peter Bongartz, Fritz Karl When Lena Reidinger suffers a fainting spell and has to go to the hospital for an examination, she witnesses the unexpected death of her bed neighbor Birgit Bischof. Her husband Egon Bischof seeks legal help from Arthur. He cannot explain his wife's sudden death. Arthur begins to research together with Julia. They find out that tests were carried out in the clinic with a new, unapproved heart medication and that Birgit Bischof was not the only victim.