WHAT IS EL TREN DEL MISTERI?

It all begins when...

"Dr. Casanova, a renowned physician of Girona, is going to his apartment in Chianti in the province of Tuscany, Italy, to spend a month's vacation with his family.
He leaves a young doctor, intelligent and kind by her private practice, convinced that he is the best substitute he could haver found.

After two weeks of absolute tranquility, Dr. Casanova received a call from the police in Girona: must return immediately to identify a corpse."