Slow Horses season 4 trailer gives big insight into new Head Dog Emma Flyte as she handcuffs Jackson Lamb

Emma Flyte with Jackson Lamb in Slow Horses season 4
New Head Dog Emma Flyte with Jackson Lamb in Slow Horses season 4 (Image credit: Apple TV Plus)

The Slow Horses season 4 trailer has finally arrived and it gives viewers a fascinating insight into Emma Flyte, a major new character in the Slow Horses world.

Emma, played by Ted Lasso's Ruth Bradley, is a huge character in the books by Mick Herron which the Apple TV Plus hit is based on. And she comes in at the start of the new series, which again stars Gary Oldman as slob spy boss Jackson Lamb.

Ex-cop Emma is now the Head Dog, in charge of MI5's internal police squad, working for top spook Diana Taverner (Kristin Scott Thomas). But is Diana telling her the whole truth about a major bomb blast that's rocked England? One thing is clear: Emma is not taking any nonsense from Lamb.

The trailer, below, sees a couple of wonderful exchanges between Flyte and Lamb. Emma: "I heard you're in charge of the rejects." Lamb: "They don't like being called that". Emma: "What do you call them?" Lamb: "The rejects."

In a further exchange, Flyte is seen putting handcuffs on Lamb. Lamb: "Handcuffs won't be necessary, come on."

Emma: "I'd rather not take any chances with a man who looks like he gropes people on buses."

Lamb: "You’re being hurtful about my appearance. I might have to call HR".

Slow Horses — Season 4 Official Trailer | Apple TV+ - YouTube Slow Horses — Season 4 Official Trailer | Apple TV+ - YouTube
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The trailer also features a huge explosion. The makers tease "a bombing that detonates personal secrets, rocking the already unstable foundations of Slough House".

Emma Flyte becomes embroiled in Jackson Lamb's world as she has to work out whether the Slow Horses are on the right path and also exactly what is motivating her boss Diana Taverner. The plot heavily involves River's grandad David Cartwright, who used to work with Lamb back during the Cold War.

Joanna Scanlan in Slow Horses

Joanna Scanlan as Moira (Image credit: Apple TV)

Emma isn't the only new character in the new series. Joanna Scanlan joins the show as fresh Slough House arrival Moira Tregorian where she meets reject spies River Cartwright (Jack Lowden), Louisa Guy (Rosalind Eleazar), Roddy Ho (Christopher Chung), Shirley Dander (Aimee-Ffion Edwards) and Marcus Longridge (Kadiff Kirwan).

Slow Horses season 4 is premiering on Wednesday, September 4, on Apple TV Plus. 

The first two episodes will be available to watch immediately, with a single new episode then releasing every Wednesday until October 2.

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David Hollingsworth
Editor

David is the What To Watch Editor and has over 20 years of experience in television journalism. He is currently writing about the latest television and film news for What To Watch.

Before working for What To Watch, David spent many years working for TV Times magazine, interviewing some of television's most famous stars including Hollywood actor Kiefer Sutherland, singer Lionel Richie and wildlife legend Sir David Attenborough. 

David started out as a writer for TV Times before becoming the title's deputy features editor and then features editor. During his time on TV Times, David also helped run the annual TV Times Awards. David is a huge Death in Paradise fan, although he's still failed to solve a case before the show's detective! He also loves James Bond and controversially thinks that Timothy Dalton was an excellent 007.

Other than watching and writing about telly, David loves playing cricket, going to the cinema, trying to improve his tennis and chasing about after his kids!