Romance of two English sisters in Tuscany. Disobeying their uncle, the two young women decide to attend a fair some hours away. A chance encounter in a train introduces them to an Englishman who gives Mab, the younger sister, a very loud little whistle. It proves handy when they are attacked by a robber in the railway waiting room overnight - and romance follows. Narrated by the elder sister. Pleasant; well-paced; slight. (PB)