Silk and Scholar by Cassandra Dean
This is Book 4 in the Silk series, but stands perfectly well alone. And it is an absolute delight.
Etta Wilding-Marsh is a very unconventional young lady indeed. The daughter of a Cambridge don, she longs to study the law, an utter impossibility for a woman in the Regency era. She has only disdain for the irresponsible young men who take for granted that which she may never have, and her particular ire is reserved for Lord Christopher Hiddleston.