Identity
Robie is known to every as The Cat. A notorious jewel thief who was in prison before a fortunate bomb broke down the cell that held him. After joining the French Revolution he was granted a pardon for his service, but now that there are jewels missing on the French Riviera all fingers point to him as the lead suspect in the robberies. The thief has distinguished himself or herself in the same manner that Robie had done, and the robberies are near identical matches to his previous crimes. Thus when the authorities discover that it is Danielle that has been robbing everyone it is a complete turnaround to their suspicions as they must let go of their pursuit of Robie and realize that he was trying to help them all along find the real thief.
Trust
In the midst of characters like Robie, Danielle, Frances and her mother we see that trust is something that is manipulated in order for people to get what they want. Frances' mother wants Robie to wed her daughter, but flaunts that she has mega-money from her deceased husband, which is a lie. Robie doesn't give Frances the full story about who Danielle is to him nor his identity as The Cat. He wants her to trust him, but he gives her very little to go on and what she sees isn't enough. And on the other side of the coin, Frances herself is in a way playing Robie to lead him to believe she is a wealthy woman looking to increase her status in society. Again, not the whole truth.
Revenge
Danielle is at the center of this major theme. She is after Robie in order to pay him back for what she believes is the betrayal of her father. She learned from Robie watching him prepare for jobs when he was The Cat and stole his moves. Now, she seeks to set him up for the robberies of jewels all along the French Riviera in order to get her ultimate revenge and see him behind bars for good.
