Summer, sun, sinister machinations - the second case for special investigator Francesco Scotti! September in Tuscany. Near Volterra, nestled in the beautiful landscape of cypresses and pines, lies the Teatro del Paradiso, where 'Romeo and Juliet' is to be performed shortly. The shock is deep when leading actress Daria collapses dead before the premiere and Inspector Scotti is faced with a mystery: because there are traces of cyanide in the bottle from which Daria drank, but the poison cannot be detected on her herself.