A review by myth
The Perfect Crimes of Marian Hayes by Cat Sebastian

5.0

Oh look, we're forming regency Leverage over here!

Do you like historical romance but long for something not Excessively Straight? This is for you. Do you want happily bi characters wherein the dude and the lady are stone cold badasses and the dude is entirely devoted? Here you go. Do you want reasonably priced love and a good egg?

...I don't actually recall eggs in this particular novel of Cat Sebastian's but this does have a discussion of parenthood and what makes you a good one or not, one example of which being the woman who does her best to run an ethical brothel and took care of her son from afar.

Also an evil duke gets murdered by his emotionally and reproductively (?) abused wife, who... is not technically legally his wife because he's a dick.

Yay!

Trigger warnings for the aforementioned abuse, but it happens off page and is discussed more as the character recovers rather than having the actual abuse shown on page.