Seriously, wtf? 
 Say you think you're a soldier with amnesia. 
 Shouldn't you at least try to find your superior officer? 
 Say you feel like masquerading as someone's husband ... 
 Shouldn't it occur to someone that you might be related to, a friend of, or a mortal enemy ... Or a casual acquaintance of that person? 
 As many regencies show (and Balogh should know this) you can't just masquerade as sir so and so. 
 The nobility is intricately connected to one another, which is why I have no idea why they think they have a chance of pulling this off.