Jacquelyn Pajot is a nine-year-old American girl whose excitement over a solo visit to her grandmother in Paris is soon diminished by the discovery that the grandmother is far more devoted to dragging her to church every day than she is in showing her the much-anticipated sights of the city. Jacquelyn's despair is remedied when she meets a pair of local girls, Nicolette and Genevieve, who are only too happy to lead the American astray. Jacquelyn, to her giddy astonishment, finds herself cajoled into joining her young companions in singing for money on the streets of Montmartre and leg kicking for laughs before the doors of the Moulin Rouge.

Jacquelyn's joy over this 'new' life is tempered when she learns the circumstances of Genevieve's father, a charming but financially struggling cobbler. Employing her own creative skills to produce a flier, Jacquelyn devises an advertising campaign that quickly spirals out of her control and into the hands of her more mischievous friends. By means both legal and not, the two French girls set a dubious course that has Jacquelyn flirting with the prospect of prison, purgatory and, most perilously, her grandmother's righteous indignation.