The Bath Quadrille (Bath Trilogy series) by Amanda Scott
So a regency romp with a bit of mystery thrown in for good measure.
I must say that by the end of the first chapter I was ready to throw up my hands in despair and walk away from our heroine Sybilla. She can be appealing but mostly she's stubborn and annoying. If I'd been Lord Ramsbury (Ned) I would have walked away long ago. Mind you he's no 'walk in the park' either.