Roma is being snubbed at school for not knowing her parents. Her guardians make up a story that she is of old English lineage and is truly Lady Partington. When she later wishes to marry a society chap, his uncle becomes suspicious.

In the life of Roma there was only one thought, who was she? She was nobody. Ridiculed by her schoolmates, she begs her guardians to tell her the truth. With her happiness at stake, they convince her that she is a distinguished English lady. Vacation time at hand, Roma is greeted into society as Lady Partington. She wins the heart of Jack Thurston, a young Englishman. Roland Fabor, a gentleman burglar, admires her. Lord Pembroke, Thurston's uncle, pays him an unexpected visit and learns of his attentions to Roma. Pembroke is an old friend of the Partington family and he knows that Partington never had a daughter. Becoming suspicious, he places a detective on the trail of Jack. Praising her guardians, Roma has Jack visit them. Unfortunately they are pawnbrokers, and this to Jack seems peculiar. Becoming furious at Jack's actions, Roma denounces him and accepts Fabor against her guardians' wishes, as they know his true character. At a reception given in Roma's honor, Fabor shows his true colors by stealing a necklace from one of the guests, and immediately leaves and goes to Roma's guardians to have it redeemed. To prove to Roma what he is, they hold Fabor and phone her. Suspecting something, Fabor escapes, leaving the necklace behind. As the detective walks in, Roma has the necklace in her hand and is accused of theft. Pembroke is notified by the detective that he has the goods on Roma. In the presence of Jack, Roma pleads with Pembroke to assist her. She shows him her locket. Opening the locket he steps back astonished.—Moving Picture World synopsis