Lethal Pill Box

The Public Security Bureau of Xiying City received a call that a woman died in her home. The deceased was holding an empty pill box, and the pills in the box were missing. The police forensic examination revealed that the cause of death was a heart attack, but the forensic examination found no drug residue during the examination. The family of the deceased insisted that the deceased was murdered. At the same time, the police discovered during the investigation that the deceased in a mystery novel had the same cause of death as the deceased in their own case!