MacGregor and the Secrets of MI6
A Maggie MacGregor Mystery #1
by Greta Sinclair
Published: September 22, 2026
Genre: Crime Fiction, Mystery, Europe, Fiction, Great Britain, Woman Sleuth
Blurb:
She came to Britain to check off a bucket list. She never expected to become part of someone else's last wish.
After years of putting everyone else first, retired American private investigator Maggie MacGregor is finally taking the trip she's dreamed about for decades: exploring Britain's castles, villages, and historic treasures.
The distinguished silver-haired gentleman seated in 4C wasn't part of Maggie's carefully planned itinerary.
Ian Blackwell is charming, quietly witty, and seems to know Britain better than any guidebook. Maggie assumes he's simply another traveler. She has no idea he's spent a lifetime keeping secrets for MI6.
Then celebrated historian Oliver Pembroke is murdered, leaving behind a cryptic message meant only for Maggie.
Suddenly, her dream vacation becomes a dangerous investigation. As Maggie and Ian follow a trail of coded recipes, forgotten journals, and long-buried secrets, they discover Oliver wasn't protecting treasure.
He was protecting history itself.
Now someone will do anything to keep the truth buried.
With danger closing in and an unexpected romance quietly unfolding, Maggie must trust the instincts she thought she'd left behind. But solving Oliver's final mystery may mean risking her heart as well.
Because it's never too late to begin again.
My Review:
MacGregor and the Secrets of MI6 is an excellent first installment to Greta Sinclair’s new series, the Maggie MacGregor Mystery. The story opens with Maggie MacGregor and Ian Blackwell on a nine-hour flight to Europe. Neither Maggie nor Ian knows at that moment that they will soon be investigating the death of celebrated historian Oliver Pembroke.
Maggie is a retired American private investigator who has come to Europe to fulfill a long-planned bucket list—one filled with Britain's historic treasures, castles, and villages. Ian is charming and subtly sharp, and he seems to know Britain inside and out, having spent a lifetime keeping secrets for MI6. But, of course, Maggie knows none of this at first.
When Oliver is murdered, Maggie and Ian work together to solve the case. Oliver knew something someone obviously wanted to keep quiet—but what was he trying to hide, or perhaps protect?
I thoroughly enjoyed every moment of MacGregor and the Secrets of MI6 and loved getting to know Maggie and Ian. I can’t wait for the next books in the series: MacGregor and the Highland Cipher (Book 2, releasing November 3, 2026) and MacGregor and the Last Keeper (Book 3, releasing December 15, 2026). If you are looking for your next captivating mystery, I highly suggest giving this book a try. Trust me, you won’t regret it for a minute. Pick up your copy today!


































