Alessandro is confined to a wheelchair due to an invalidating illness, and his apartment window has his world: his favourite place where he can study and observe the lives of the other residents in his block of flats. A bloody murder disrupts the peaceful routine of Alessandro’s life and in his diary, a meticulous witness, he records every event, every one of his neighbours’ small gestures or habits. Inspector Barbieri involves him in his enquiries, convinced that his experience as a writer can help uncover the assassin, but the chronicle of a murder does not always mirror reality...