Never Sleep: The Chronicle of a Lady Detective by K.B. Owen

She's estranged from her husband but she misses working with him.  He's a Pinkerton agent and she'd like to be one, too.  So when he asks her to help infiltrate a household and get information for him she's willing to try.  She thinks it will be fun but it's also dangerous...

The author and instaFreebies allowed me to read this book for review (thank you).  It has been published so you can grab a copy now.

Every thing is going along well when she arrives.  She's accepted and treated as a guest.  Her only difficulty is when they invite a man she knows and dated at one time.  She has to try to get him alone so she can explain and can ask him to keep her work confidential.  He's not sure about it but he still cares so he does.

When a young man is killed because he walked in the room first and the son is only slightly injured, her job gets more important.  Who was supposed to be killed and why?

While her estranged husband plays body guard, she waits until an opportune time to snoop through paperwork.  What she finds gives her a clue but will she be able to stop the assassination in time?

She's smart enough and competent enough to be Pinkerton agent.  She's also stirred up an old love.  I'll be interested to read more in this series.  While this is a novella, the story is complete and well told.  Give it a try.