It Happened in Arles = Mystery in Arles — Mabel Esther Allan

Damaris Cleveland finds mystery and adventure beyond her dreams in the wild, beautiful countryside of Aries and the Camargue. Damaris goes to spend the summer along with her cousin Celia in the household of the Gironelles where Celia has been an old familiar. She knows before she goes that something is wrong with the household in Arles. There the younger of the two Gironelles' boys, Paul, 23, seems to be in some sort of trouble which is identified, through an overheard conversation, as blackmail. Set in the Camargue countryside of Italy, Damaris investigates the problems of the family she is staying with and stumbles upon a murder.