Meet Miss Jane Treen – the coffee-drinking cat lover dressed head to toe in tweed, who just happens to be a secret super sleuth!
London, 1941: Miss Jane Treen is at her desk, strong black coffee in hand and fluffy ginger cat by her side, when her top-secret government work is interrupted by an urgent call to Devon. A woman has been found dead in a lake in a place where she shouldn’t have been. Jane needs to gather the clues and find the killer before someone else from the agency gets hurt…

Shy and handsome code-breaker Arthur Cilento is bewildered by the arrival of the efficient Miss Treen and her cat Marmaduke. She bursts into his life unexpectedly, forcing him out of his comfort zone. The reluctant colleagues huddle near the warmth of a crackling fire in Arthur’s country home, working to piece together the murderous puzzle at hand.
In the sleepy Devon village, someone is hiding something: but is it the busybody vicar and his sister, the dutiful housekeeper and her secretive son, the stern librarian, or someone else altogether? And who were the people with the woman in the lake on the day she died?
No sooner have Arthur and Jane have drawn up a list of suspects, than a parcel reveals a clue that sends them in hot pursuit of a coded diary stashed in a village church. But as the heavy wooden door slams behind them and a key turns in the lock, one thing is sure: they need to unravel the truth and crack this code before the killer decides their number is up…
But if they can catch the culprit in time, might this unusual pair become the finest crime-solving partnership since Holmes and Watson hung up their hats…?
If you love twisty crime novels, top-secret intrigue and the very best of Golden Age mysteries, then you will adore Helena Dixon’s totally gripping cozy novel, perfect for fans of Agatha Christie, T E Kinsey and Verity Bright!
About the Author

Helena Dixon is the author of the best-selling Miss Underhay murder mystery series and lives in Devon. Married to the same man for over thirty-five years she has three daughters, a cactus called Spike, and a crazy cockapoo. She is allergic to adhesives, apples, tinsel and housework.
She was winner of The Romance Prize in 2007 and Love Story of the Year 2010 as Nell Dixon.
https://www.facebook.com/nelldixonauthor
https://www.instagram.com/helenadixonuk
Review
The Secret Detective Agency is a new series from the author of the Miss Underhay cosy historical mysteries. This time the action takes place during the Second World War.
In a move away from the genteel society of the 1930s, Britain is now at war and Miss Jane Treen is working at the War Office, co-ordinating agents out in the field. When a body is found out in the countryside, she heads out of own to the home of Arthur Cilento, academic and code breaker for the War Office. A number of field agents are missing, and two have been found dead. There is suspicion of a mole in the War Office that could put everyone in danger.
Together, Jane and Arthur must solve the mystery and work out if there are bigger implications of the death on national security.
This first novel is as much about meeting the main characters, but there’s a deviously twisty plot to keep us and the protagonists on our toes. In a world of spies and subterfuge, is anyone who they claim to be?
What I enjoy most about Helena Dixon mysteries is the strong female protagonists, doing their best in worlds where their options are limited by society. They often go against the societal norms, but not in a way that feels jarring against what we know of the time. The research that goes into these novels brings the time periods to life for the reader, educating them about life in that period, without being overwhelming. The period detail is tightly woven into the plots, fully immersing the reader in the story.
I was really happy to hear Kristen Atherton providing the voice for the audiobook. She’s a wonderful narrator, and is the voice of many of my favourite series. She reads the material so well, with excellent characterisation.
This is a series I’ll be sure to follow closely.
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