Royally Roma by Teri Wilson

In this charming, modern retelling of the classic Audrey Hepburn film Roman Holiday, a royal prince tries to escape his hectic and rigid life and ends up leading a young graduate student on a chase through the Eternal City.

Julia Costa is too busy trying to complete her PhD while also holding down a full-time job as a private tour guide in Rome to keep up with celebrity gossip. So when she crosses paths with a real, actual prince, she mistakes him for a client and takes him on a daylong tour of the city.

Intrigued by the idea of spending time with someone who obviously has no idea who he is, and delighted at the prospect of a day free of royal obligations, Niccolo La Torre, Crown Prince of Lazaretto, acts on impulse and assumes the role of Julia’s client. He swears to himself that he’ll return to his royal duties after only half a day…but he’s having the time of his life.

Until Julia presents him with the bill. Since he snuck out of the hotel without so much as a dime, he tries to escape, only to discover that she won’t let him out of her sight until he can pay her back. She’s determined to get her money…and perhaps more from the handsome stranger she’s fallen for.