A gripping standalone spy thriller from the #1 Sunday Times bestselling author of Slow Horses, with a riveting reveal about a disastrous MI5 mission in Cold War Berlin—an absolute must-read for Slough House fans.

New from the author of Slow Horses, now an Apple Original series from Apple TV+, starring Gary Oldman and Kristin Scott Thomas.

First 40 Pre-Orders will receive a special limited edition tote free with their book!

Two years ago, a hostile Prime Minister launched the Monochrome inquiry, investigating "historical over-reaching" by the British Secret Service. Monochrome’s mission was to ferret out any hint of misconduct by any MI5 officer—and allowed Griselda Fleet and Malcolm Kyle, the two civil servants seconded to the project, unfettered access to any and all confidential information in the Service archives in order to do so.  

But MI5’s formidable First Desk did not become Britain’s top spy by accident, and she has successfully thwarted the inquiry at every turn. Now the administration that created Monochrome has been ousted, the investigation is a total bust—and Griselda and Malcolm are stuck watching as their career prospects are washed away by the pounding London rain.

Until the eve of Monochrome’s shuttering, when an MI5 case file appears without explanation. It is the buried history of a classified operation in 1994 Berlin—an operation that ended in tragedy and scandal, whose cover-up has rewritten thirty years of Service history.

The Secret Hours is a dazzling entry point into Mick Herron’s body of work, a standalone spy thriller that is at once unnerving, poignant, and laugh-out-loud funny. It is also the breathtaking secret history that Slough House fans have been waiting for.

Mick Herron is a British novelist and short story writer who was born in Newcastle and studied English at Oxford. He is the author of the Slough House espionage series, four Oxford mysteries, and three standalone novels. His work has won the CWA Gold Dagger for Best Crime Novel, the Steel Dagger for Best Thriller, the Theakston’s Novel of the Year Award, the Palle Rosenkrantz Prize, the Ellery Queen Readers Award and the USC Libraries Scripter Award, and been nominated for the Macavity, Barry and Shamus Awards. He currently lives in Oxford and writes full-time.

Luisa Smith is the Buying Director of Book Passage, where she has worked for over 25 years, and Editor in Chief of Penzler Publishers which includes the literary mystery imprint Mysterious Press and the psychological suspense imprint Scarlet, as well as American Mystery Classics and Crime Ink. She grew up surrounded by books as her father is the bestselling author, Martin Cruz Smith. A childhood filled with books has resulted in a lifelong love of every aspect of the world of books, but the mystery genre holds a particularly special place in her heart.