After a UniVox win, the Zamboneys are closing their world tour on a high note. But as Mary leaves the stage at Wembley, she steps into more than a summer supporting her girlfriend, Princess Betty, on a run up to the Olympics. The two are about to embark on a new adventure - a royal tour!

With the ascension of Betty's cousin, Queen Cecilia (Cici), comes a celebration for the ages and Mary is invited. The problem is, no matter how welcoming the royals are, Mary isn't convinced she belongs. And when it becomes clear that the pressure is on to propose, Mary isn't sure she's able to meet the mark and move from royal girlfriend to wife to a vivacious, outgoing princess.

But maybe Betty has an idea up her sleeve...