The Deadly Pillbox

The Xiying City Public Security Bureau received a report that a woman had died in her own home. The deceased was clutching an empty medicine box, and the pills inside had vanished without a trace. A forensic examination by the police determined that she had died of a heart attack, but found no drug residue in her body. Her family insisted she had been murdered. Meanwhile, the police discovered that the victim in a detective novel had died in exactly the same way as the victim in their case!