Young shop-girl Mamie Conroy and wealthy Jeanette Gregory become close friends. When Mamie foils an attempted abduction of Jeanette, the latter's grandfather, Simon Gregory, brings Mamie into his home and treats her like a member of the family. But she is again involved in a kidnapping attempt and is herself accused of robbery.

Thinking it is a worthless trinket, Dorothy trades her husband’s prized Aztec idol to a street peddler in exchange for a beautiful silk shawl. She soon discovers the idol is actually an extremely valuable artifact. Desperate to retrieve it before her husband notices, she learns that it has already been purchased by their neighbor, an artist named Cambridge. Dorothy enters Cambridge’s apartment to recover the idol secretly. Her efforts lead to a series of comedic misunderstandings and frantic situations as she tries to protect her marriage and her husband's property.