One of my characters in A Whole New Plan is a female Pinkerton detective. Lydia Spencer is hiding in plain sight as a teacher. But she’s working undercover to help catch a crime boss back in Cincinnati and protect one of her new teacher friends. I’ve had several people ask ‘what is a Pinkerton?’, so I wanted to share with you the historical background of Allan Pinkerton and the agency he founded in 1850.
What’s the Pinkerton Detective Agency?
Allen Pinkerton was a Scottish immigrant. The Pinkerton National Detective Agency became America’s first and most famous private law enforcement organization. Originating in Chicago and expanding into Their motto was “We Never Sleep” and they had a logo with an open-eye in it to promote as such.

The Pinkerton National Detective Agency specialized in railway, stagecoach, and bank theft. They were known for tracking down burglars, counterfeiters, forgers, and the oft-feared masked hold -up robbers, including famous outlaws like Jesse James and Butch Cassidy.
Before the creation of the agency, Allen was settling in a new land and figuring out his future. He had unintentionally discovered a band of counterfeiters, reported it to the sheriff, and then found himself being appointed in 1849 as the first police detective of Cook County, Illinois. That led to him starting the Pinkerton agency. Mr. Pinkerton’s goal was to pursue justice and decrease crime. And he was good at it.
He had a natural talent for investigations and solved many different types of cases including a grave-robber case (medical students) that was promoted in several newspapers (what we would call viral today). The widespread attention caused a flood of new clients to seek his services.
What About Female Pinkerton Detectives?
Allen Pinkerton was a forward thinker. He hired the first female detective, Kate Warne. From research, it’s been said that Kate approached Allan and convinced him to give her a trial. In an excerpt from his book – The Murderer and the Fortune Teller, first published in 1877.
Previous to the early part of 1855, I had never regularly employed any female detectives; nor were women engaged in that capacity in any part of the Union. My first experience with them was due to Mrs. Kate Warne, an intelligent, brilliant, and accomplished lady. She offered her services to me in the early spring of that year, and, in spite of the novelty of her proposition, I determined to give her a trial. She soon showed such tact, readiness of resource, ability to read character, intuitive perception of motives, and rare discretion, that I created a female department in the agency, and made Mrs. Warne the superintendent thereof.
Kate opened an agency office in Cincinnati. Which is where I got the idea for the agency house in my story, and having Kate be included in A Whole New Plan as Lydia’s boss. (Please note, since this is fiction, I took liberties with the timeline in order to fit my story world and have Kate in it.)

In real life, it was Kate that implemented a plan to protect President-elect Abraham Lincoln in order to get him to his inauguration safely. It was because of this connection that I decided to name Lydia’s dog Fido. Lincoln had a dog name Fido, and that was well known. It’s one of the reasons Fido was a more popular dog name at that time.
Finding Books with Female Pinkerton Detectives
I have read several books through the years where the main character is a Pinkerton detective and have enjoyed them all. Possibly the ones with women as Pinkerton’s even more. Some of you have asked for additional reads with female Pinkerton leads. I didn’t keep track specifically of them because I didn’t know I would be writing one, but I wanted to highlight a few.
One of the first books I ever came across was Margaret Brownley’s series Undercover Ladies. They were released starting in 2014, and I had found two of them at a library book sale. I then found the first one title Petticoat Detective on Amazon. I held onto them because I enjoyed them so much.

Another story I’ve recently read is An Agent for Dixie by Linda Carroll-Bradd. Linda and I are part of a local writing group and when I saw she had written one, I couldn’t wait to read it. The premise is that the female Pinkerton must be trained by a male counterpart. This story is part of large series called Pinkerton Matchmakers by different authors.

A Whole New Plan has a Female Pinkerton Detective
In my book, A Whole New Plan, Lydia thrives (or so she thinks) on working alone. She’s been trained by Kate and has something to prove to others and to herself. Little did she know God would send her on a completely different path than what she had planned for herself.
✨ Perfect for readers who love:
- Fake engagements that lead to real feelings 💍
- Opposites attract romances—an adventurous agent and a steady pastor ❤️
- Strong heroines in unconventional roles (female Pinkerton detective!) 🔍
- Forced proximity and traveling together on dangerous missions 🚂
- Small-town mysteries with a dash of frontier charm 🌾
- Secrets, hidden identities, and reluctant confessions 🤫
- Faith-tested journeys where God’s plan shines brighter than fear 🙏
- Gentle, swoony romance wrapped in historical Christian adventure 🌹
Here’s the book blurb:
Sometimes God’s best plan is the one we never expected.
California, 1870. Pastor William Baker built his life on steady faith and safe choices, but the arrival of Lydia Spencer upends everything. Independent, outspoken, and hiding a limp from a recent injury, Lydia is unlike any woman he’s ever known. And she has no interest in church—or in sharing her secrets.
What Will doesn’t realize is that Lydia is a Pinkerton detective, undercover as a schoolteacher while tracking a dangerous crime boss. She’s determined to protect her friends in Washton… even if it means keeping her distance from the kind, steadfast pastor who sees too much.
When strange thefts strike the ranch and a frightened boy appears with ties to their past, Will and Lydia are thrown together in a search for truth—and find themselves fighting not only for justice, but for a future neither had planned.
Full of faith, mystery, and romance, A Whole New Plan weaves a story of healing hearts, unexpected love, and God’s perfect design.
there’s a little bit for everyone in this story:
💕 Romance Tropes
- Slow Burn Romance
- Opposites Attract
- Pretend Engagement / Fake Relationship
- Out of My League
- Forced Proximity
- Protector Hero
🔍 Mystery/Adventure Tropes
- Pinkerton Agent / Lady Detective
- Small-Town Mystery
- Undercover Investigation
- Secrets & Hidden Identity
Best-laid Plans Series
A Whole New Plan is the fourth book to launch in the Best-laid Plans Series.
Three young women. One new beginning. A journey of faith, friendship, and unexpected love.
It’s 1869 and three young women travel to Sacramento, California, ready to begin new lives as teachers in the rural one-room schoolhouses of the West. But the plans they carefully laid soon give way to something far greater. As God gently redirects their paths, each woman discovers lessons in friendship, faith, and trust—and encounters the most surprising gift of all: love.
They weren’t searching for it.
They never expected it.
But they may just find everything their hearts truly need.
No Plan at All was a side story that came out of the first book, although these characters are related to Will, the hero in A Whole New Plan and are part of this story.
To read in chronological order, here’s a timeline order of the books:
- Book .5 – No Plan at All (prequel, Sarah and Alex, 1867) (Amazon is calling this book 3)
- Book 1 – When Plans Go Awry (Olivia and Luke, 1869)
- Book 2 – A Slight Change of Plans (Jenny and Ren, 1870)
- Book 3 – A Whole New Plan (Lydia and Will, 1870)

If you’d like to read more about Allen Pinkerton, Kate Warne, or the Pinkerton Detective Agency, the Hero’s, Heroine’s, & History blog has a bunch of different blog posts on these topics. I provided a link to the search term, Pinkerton, to find them all for you.






