Based on

Movies like The Cipher Message (1913)

Two English crooks, Lionel Verker and his sister, Marie, come to America, where at a seaside resort Lionel makes a heroic rescue by saving Bob Kent, the son of a millionaire, from drowning. He is introduced to the Kent family. Learning that there is a position of lady's maid open in the house, he wires his sister to come at once. With the aid of false references she obtains the position. At a lawn fete Muriel, the daughter of the millionaire, wears a lot of jewelry. Lionel notices this and after a dance with him she misses one of her diamonds.