已婚夫妻Luca及Susi雖有义务卻绰绰缺乏，一家四口勉強度日美少女Mary來家裡打工換宿，瞬間改變了家裡的氣氛，也迷倒Luca父子

Buffalmacco and his friend Bruno Degli Olivieri make a joke of Calandrino, forcing him, for ten florins, to buy a stone that should make invisible the one who owns it.