The Secret Letterbox — A Dartmoor Mystery by John Kemp

Looking for a haunting British mystery novel steeped in atmospheric suspense? The Secret Letterbox by John Kemp is a gripping psychological crime thriller set against the bleak and beautiful backdrop of Dartmoor. Perfect for fans of UK crime fiction and family secret mysteries, this page-turner explores the dark bonds of brotherhood and the ghosts that refuse to stay buried on the wild moors.

A Mystery. A Bond. A Presence That Won’t Let Go.

When Neal Havers is drawn back to Dartmoor following his brother’s disappearance, memories of a childhood tragedy begin to resurface. As he searches the moors for answers, he finds himself confronting secrets that reach back decades—and a presence he cannot easily explain.

About The Secret Letterbox

Three brothers.
One dead.
One missing.
One searching for the truth.
Thirty years ago, on the wild moors, Alan Havers died in a tragic accident. His brothers never recovered. Neal left—and never looked back.
Until now.
When Steven vanishes without a trace, Neal is drawn back to the place he has spent a lifetime trying to forget.
But Dartmoor holds memories of its own.
As Neal searches for his missing brother, strange things begin to happen. A voice calls to him from the empty moor. A presence seems to follow him. And an old secret begins pulling him toward a place the brothers once knew well.
The Secret Letterbox.
Is Neal being led to the truth—or into something that should have remained buried?
Some secrets refuse to stay hidden.
And some bonds refuse to die.

Behind The Secret Letterbox

What inspired the story? What is it like writing a mystery set on Dartmoor?

Read John Kemp’s Q&A about writing The Secret Letterbox → https://johnkempauthor.com/2026/02/17/the-secret-letterbox-qa/

What readers are saying

Readers’ Favorite

Reviewed by Melinda Hills for Readers’ Favorite

“Well written and smooth-flowing, The Secret Letterbox by John Kemp is a delightful read with just enough mystery and intrigue to be exciting.”

Read the full review at Readers’ Favorite → https://readersfavorite.com/book-review/the-secret-letterbox

Readers’ Favorite reviewer Melinda Hills praises the novel’s mystery, adventure and gentle supernatural elements, while highlighting its exploration of the enduring bond between siblings.

From Amazon Readers:

At first I thought this book was going to be predictable, but it wasn’t. It was a mystery, a story of love and sorrow and remembrance and I will be thinking of it for a while to come.

★★★★★
5 out of 5 stars — “Loved this book”
Amazon reader review.

With a light and eminently readable touch, the author combines elements of mystery, murder and fantasy, with well-drawn, sympathetic characters into a story which keeps you guessing to the end. Couldn’t put it down!

★★★★★
5 out of 5 stars — “Loved it!”
Amazon reader review.

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