The three dominant themes of this season's crop of drama series are detectives, fathers and hospitals, all of which can be found in this week's "Monday Mystery Theatre" (TBS, 9 p.m.). In "The Man Who Pursues the Truth," a brilliant surgeon investigates the death of a man who, like himself, lost a daughter under mysterious circumstances.

Dr. Jinguji (Nenji Kobayashi) is one of the most famous heart surgeons in the world. His life is turned upside-down after his daughter falls out of a window. Despite all his surgical efforts, he cannot save her. Deeply depressed, the doctor gives up medicine and becomes obsessed with finding out why she fell. He doesn't believe the police, who conclude that the death was an accident.

A year later, he attends a memorial ceremony for one of his medical mentors and meets a man whose own daughter also died under mysterious circumstances. One night, the man is rushed to the hospital complaining of severe abdominal pain. He is diagnosed with an acute ulcer and admitted to the hospital for routine treatment. But the next day, the hospital calls his family and says that he died during the night. Dr. Jinguji, thinking it strange that someone suffering from an ulcer would die under hospital care, decides to become involved in the case from a medical standpoint. When he studies the dead man's medical charts, he discovers some disturbing things.