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1. Hidden In Plain Sight by itsmebethy

   Fandoms: Slow Horses (TV), Slough House - Mick Herron  

   • Mature
   • No Archive Warnings Apply
   • F/M
   • Complete Work

   24 Nov 2025

   Tags

   • No Archive Warnings Apply
   • River Cartwright/Original Female Character(s)
   • River Cartwright
   • Jackson Lamb (Slow Horses)
   • Original Female Character(s)
   • Catherine Standish
   • Louisa Guy
   • Roddy Ho
   • Shirley Dander
   • Cryptography
   • MI5 - Freeform
   • spythriller
   • SlowBurnRomance
   • EmotionallyGuardedHero

   Summary

   Stuck at Slough House and quietly coming apart, River Cartwright never expected a routine errand to cryptology to change anything. Then he meets Annie Stuart — sharp, brilliant, and impossible to ignore. But her talents haven’t gone unnoticed, and some secrets are more dangerous than they look.

   Every code has its flaw. Every spy does too.

   This story is set immediately after Slow Horses Season 4.

   **Completed**

   Language:

   English

   Words:

   42,434

   Chapters:

   28/28

   Comments:

   123

   Kudos:

   139

   Bookmarks:

   14

   Hits:

   3,513