Pride & Justice by Timothy Bowden

Regency England.
With no organised police force, there is nothing to stand in the way of a new breed of costumed villains, who hide their identities behind aliases and prey on the vulnerable.
Nothing, that is, except for the Vigils.
Elizabeth Bennet is one; living a double life of accomplished but headstrong young woman by day, and masked, leather-armoured crimefighter by night.
News of a dangerous villain targeting Hertfordshire leads her to suspect the newly-arrived Mr Bingley; the young man her older sister happens to be falling in love with. Could he be responsible for the abduction of several local girls? And where does his brooding friend, the infuriating Mr Darcy fit in?
Elizabeth must fight two secret battles at once. One is physical, against the villain and his henchmen as she seeks to uncover his identity and thwart his evil plans. The other, also clandestine, is waged in the assembly halls and drawing rooms as she fights for her happiness, to carve out her own space within the confines society has set for her.
Can a life lived in two halves ever be made whole when everything is at stake?
Does Elizabeth Bennet need her own hero? Absolutely not.