MacGregor and the Highland Cipher
A Maggie MacGregor Mystery #2
by Greta Sinclair
Published: November 3, 2026
Genre: Crime Fiction, Mystery, Europe, Fiction, Great Britain, Woman Sleuth
Blurb:
She came to Scotland searching for history. She never expected the past to be waiting for her.
Retired American private investigator Maggie MacGregor's British adventure isn't over yet.
With MI6 officer Ian Blackwell by her side, Scotland should be the perfect next chapter: ancient castles, mist-covered Highlands, and a chance for Maggie to explore the country tied to the MacGregor name she's carried for decades.
Then historian Alistair Ainsworth is murdered.
What begins as a journey into Scotland's past becomes a dangerous investigation when Maggie and Ian discover a mysterious cipher hidden within old letters, family records, and music.
As Maggie follows a trail of family secrets, hidden loyalties, and clues concealed for generations, one thing becomes clear: someone is willing to kill to keep the truth from coming to light.
But unraveling another family's past forces Maggie to confront her own—and the twenty-five years she lost with her sons.
With a killer closing in and her relationship with Ian deepening, Maggie must decide how much of the past she's willing to carry into her future.
Because you can't change the years you've lost. But you can choose what you do with the years still ahead.
My Review:
Maggie MacGregor’s British vacation continues! In this second book of the series, the retired American PI and MI6 officer Ian Blackwell head to the Scottish Highlands. Between exploring ancient books and beautifully vivid, leaky old castles, they are trying to solve a historical mystery.
But things take a dark turn when historian Alistair Ainsworth is found dead. It seems Alistair knew a secret that someone was desperate to keep buried. On top of the murder, Maggie is dealing with deep personal regrets after being out of her sons' lives for twenty-five years. Can she truly make up for lost time, or will she have to learn to let go of the past to build a future?
Greta Sinclair delivers another fantastic installment with MacGregor and the Highland Cipher. The atmosphere is incredibly rich—the descriptions of the damp, dripping castles made the whole setting feel remarkably real.
I'm completely hooked on Maggie and Ian's dynamic and can't wait for the next book, MacGregor and the Last Keeper.
If you love a great mystery, grab this book, MacGregor and the Highland Cipher (and book one, MacGregor and the Secrets of MI6) right now!
Check out all the books in the Maggie MacGregor Mystery Series I’ve read.
MacGregor and the Secrets of MI6 #1
MacGregor and the Highland Cipher #2
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