Simon Marlton, Viscount Adler, was not accustomed to discovering at night lovely strangers in boyish attire secretly sneaking into his house, throwing themselves on his neck with kisses, and then mysteriously disappearing. He was even more shocked by the fact that the ring he inherited from his father had disappeared along with the mysterious young lady. Who is this girl? How to find her? Why did she steal this ring? Some evidence points to Simon's neighbor, the artist Emma Trafford. But how can this decent and modest young lady turn out to be that daring, charming stranger who stole his heart with just a fleeting meeting and a jewel?