1917. New York._x000D_Notorious spy Fredrick Fredricks has invited Fiona to Carnegie Hall to hear a famous soprano. It's an opportunity the War Office can't turn down. Fiona and Clifford are soon on their way but not before Fiona is saddled with chaperon duties for Captain Hall's niece. Is Fiona a spy or a glorified babysitter?_x000D_From the minute Fiona meets the soprano aboard the RMS Adriatic it's treble on the high C’s. Fiona sees something - or someone - thrown overboard and then she overhears a chemist plotting in German with one of her own countrymen!_x000D_And the trouble doesn't stop when they disembark. Soon Fiona is doing time with a group of suffragettes and investigating America's most impressive inventor Thomas Edison._x000D_When her number one suspect turns up dead at the opera and Fredrick Fredricks is caught red-handed it looks like it's finally curtains for the notorious spy._x000D_But all the evidence points to his innocence. Will Fiona change her tune and clear her nemesis' name? Or will she do her duty? And just what is she going to do with the pesky Kitty Lane? Not to mention swoon-worthy Archie Somersby . . ._x000D_If Fiona's going to come out on top she's going to have to make the most difficult decision of her life: the choice between her head and her heart.
