A Beautiful Disguise (The Imposters Book #1)

In Edwardian London, not all that glitters is gold as a lady and an intelligence officer's secret mission take them from the city's dazzling ballrooms to its covert intelligence offices. Sir Merritt Livingstone has spent a decade serving the monarch in the field, but when pneumonia lands him behind a desk in the War Office Intelligence Division just as they're creating a new secret intelligence branch, he's intent on showing his worth. He suspects an aristocrat of leaking information to Germany