You did it! We figured this one out! It is a truth universally acknowledged (by me for certain) that the Bitchery pretty much knows everything, and really, it's true. Scroll down to see the solution for this HaBO - and many thanks!
This HaBO request is from Golder, who is trying to track down a series:
I’m looking for a book series I read as a teenager that I loved, but I’ve now totally forgotten about.
It was a romance with some mystery starring a young girl (I think she was 19 or 20) in the 1920s, who loved solving mysteries. In the first book she has a huge crush on a detective, who in typical well-meaning yet ignorant alpha male fashion was trying to discourage her from her crime solving ways, but ended up kissing her at end (??). As the series progressed, she ended up falling for the detective (possibly millionaire step brother?).
It lacked A-goes-into-B sex scenes, but my teenage self thought the love scenes were very hot.
Any idea who was the author of this series? I think I’d like to read them again.
The hero is a detective and may also be a millionaire and the heroine’s step brother. That’s quite the romance hero resume.