‘Slow Horses’ Director on Season 6 and That Final Jack Lowden Scene: ‘We Had Two Endings and One of Them Was Happy’

The Season 6 finale of “Slow Horses” leaves River Cartwright collapsed and struggling to breathe, raising doubts about whether Jack Lowden’s character has survived. Director Adam Randall says the scene was designed to leave viewers uncertain, while a Season 7 teaser has added to speculation about River’s fate.

The season also brings back Sid Baker, presumed dead since Season 1, and develops her relationship with River. Randall says the actors filmed two endings for the couple, including a happier one that was not used. The finale follows the deaths of Coe and Emma Flyte, among others; the supplied article excerpt also describes production challenges in staging an action sequence and finding a suitable house.