Morgan writes delightfully, particularly dialogue which one can imagine people actually saying (certainly saying to themselves, on the staircase, on the way out). She refurbishes the Regency novel without 'rethinking' it. There is nothing about the plot that isn't true of terrible genre novels. The heroine is poor and plucky, knows more than she is supposed to at her age but less than she needs to in her station, tries to protect her friends when it is not at all clear how, and finally achieves safe harbor in a good engagement.
Still, it's giggling-aloud funny, and the characters were real (not, perhaps, realistic; slightly Dickensian). My only regret is that now it will be harder to enjoy fluff written by worse writers.
WorldCat (Find in a Library) for Indiscretion
So wrote clew in Fiction (21st c.).