These are pretty easy reads in this series.
The Pinkerton Agency is hiring women agents, but she has to be married to a male experienced agent before she can be considered a full-fledged agent. At the end of her first assignment, if they choose to annul their marriage they can. If a man isn't willing to marry then he is out of a job!
Sabrina is a former saloon girl. She walks into the agency and doesn't really give them much information about herself, and definitely not that tid bit! Her new husband isn't interested in staying married, he's doesn't feel he is worthy of any woman, just as she feels unfit for any man - but the grow closer despite their expectations.
Their job is to help a saloon owner who is being targeted by a Reverend and a group of six women who want the saloon shut down - funny thing is, they are the only saloon being targeted! Hmmm?
Clean read.