Apple TV’s masterful spy drama series Slow Horses has always known how to kick off a season in style. Who could forget the thrilling Stansted Airport set piece from the first installment? Or the second season beginning with the mysterious death of former agent Dickie Bow? More recently, season 3 impressed only minutes in with a James Bond-esque chase through the streets of Istanbul. All these opening scenes are immediately gripping, but the secret to the show’s success is the fact that each season only gets better from there.

Thankfully, the same can be said for the upcoming fourth season. Adapted from author Mick Herron’s fourth novel in the Slough House book series, titled Spook Street, we rejoin our not-so-merry band of dysfunctional MI5 agents as the threat levels in the UK reach a critical point following a suicide bomber targeting a shopping mall. That’s only the start of the story though, as our misfits are pulled into a case that is the show’s most personal one yet.

Spook Street Just like with previous chapters, two storylines run concurrently here before seamlessly coming together as the connections between the mysteries are uncovered. At the park, Kristin Scott Thomas’ Taverner and co. are busy looking into the terrorist attack, trying to figure out if another bomb is likely.

However, this is Taverner we are talking about, who – as ever – remains full of surprises, particularly when her reputation comes under threat. She is willing to do anything –.