On her majesty's frightfully secret service

Summary: "When Darcy runs off on another secret assignment, I am left to figure out how to travel to Italy sans maid and chaperone to help my dear friend Belinda, as she awaits the birth of her baby alone. An opportunity presents itself in a most unexpected way--my cousin the queen is in need of a spy to attend a house party in the Italian lake country. The Prince of Wales and the dreadful Mrs. Simpson have been invited, and Her Majesty is anxious to thwart a possible secret wedding. What luck! A chance to see Belinda and please the queen as I seek her permission to relinquish my claim to the throne so I can marry Darcy. Only that's as far as my good fortune takes me. I soon discover that Mummy is attending the villa party and she has her own secret task for me. Then, Darcy shows up and tells me that the fate of a world on the brink of war could very well depend on what I overhear at dinner! I shouldn't be all that surprised when one of my fellow guests is murdered and my Italian holiday becomes a nightmare.."--