What if...?
Series Metadata
Listing Series
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What if...? Part One by Edie_Sunshine
Fandoms: Slow Horses (TV), Slough House - Mick Herron
27 Sep 2025
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Summary
What if... River Cartwright was at the Glasshouse with Spider Webb and Louisa Guy during Season 2, instead of Marcus Longridge?
When Min Harper is killed in a hit and run accident, Jackson Lamb sends River along as his replacement.
James 'Spider' Webb is unimpressed: he's still dealing with the fall out from the last time they met, and frankly, he's got more important things to think about, like getting himself back into Diana Taverner's good books after that whole Hassan Ahmed embarrassment.
For River, the assignment is a chance to once more prove himself a capable agent, get back into Regent's Park, where he belongs.
Of course, this being Slough House, nothing ever goes according to plan...
Series
- Part 1 of What if...?
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What if...? Part Two by Edie_Sunshine
Fandoms: Slow Horses (TV), Slough House - Mick Herron
09 Oct 2025
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Summary
The thing of it is, in spite of Slough House, and the worry of his grandfather, River is happy. He has no idea what this thing with James really is, whether it will survive them, but he’s stupidly, embarrassingly happy. And there are moments when they look at each other and he’s sure James is feeling the exact same thing.
Everything's great until the inevitable betrayal... Well, once a Spider, always a spider, eh?
Just as Part One was a 'do over' of Season 2, this is a 'do over' of Season 3...
Series
- Part 2 of What if...?
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What if...? Part Three by Edie_Sunshine
Fandoms: Slow Horses (TV), Slough House - Mick Herron
06 Nov 2025
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Summary
Sitting in a pub with Jackson Lamb of all people, River receives a phone call...
Series
- Part 3 of What if...?
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What if...? Part Four by Edie_Sunshine
Fandoms: Slow Horses (TV), Slough House - Mick Herron
04 May 2026
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Summary
Set during Season 5, James is stuck in Dubai on business, Louisa's just dropped a bombshell and could River's weekend get any worse?
Series
- Part 4 of What if...?
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What if...? Part Five by Edie_Sunshine
Fandoms: Slow Horses (TV), Slough House - Mick Herron
28 May 2026
Tags
Summary
“What? Gimme— it’s just shampoo.”
“River, feel free to use half a bottle of your own supermarket branded trash, but not my Jo f***ing Malone.”
In other words, just a day in the life of our favourite idiots....
Series
- Part 5 of What if...?