The Stolen Saphire

Samantha sets sail with her adopted sister Nellie and her two grandparents to Europe. On board with them is a famed archeologist and a legendary Saphire that is now in his possesion. During dinner one night, the Saphire is stolen from him and Samantha and Nellie's French tutor is accused of commiting the crime. All circumstancial evidence points towards her, but the two girls are determined to prove her innocence.