The Real Story Behind 'The Monster of Florence' Antonio Banderas will star in a new TV series about the infamous Italian serial killer. For now, here's all you need to know. Sony Pictures Real Stories is an ongoing column about the true stories behind movies and TV shows. It’s that simple. This installment focuses on the true story of The Monster of Florence. Four years ago this month, Italian officials reopened a criminal investigation into the “Monster of Florence,” a serial killer who murdered at least sixteen people over a twenty-seven-year span. Antonio Banderas will play a journalist in pursuit of the killer in a new six-hour limited series titled