The leading tenor is murdered on the first night of Giacomo Puccini's 'La Boheme' at the Teatro Carlo Felice Opera House in Genoa, Italy. Inspector Marcus Monticello and assistant Lieutenant Gabriella de Firenze set out to bring the culprit to justice. Their investigation takes on a wider dimension when they uncover a conspiracy where murder and contract killing are a way of life to men who will stop at nothing to accumulate large sums of money by criminal activities. One man holds the key to unlock the secrets behind a spate of killings. The search for this man takes them into Genoa's Old Quarter, the Citta Vecchia, the oldest medieval town in Europe.