Apple TV to stream Slow Horses Season 5 on Sept. 24

Apple TV will begin streaming the fifth season of Slow Horses on Sept. 24, the streamer and the series’ new trailer confirm, plunging Gary Oldman’s disgruntled MI5 leader Jackson Lamb and his team of misfit agents back into a web of murder, terror and political intrigue centered on a surprising development in the life of resident tech operative Roddy Ho. The season, adapted for television from Mick Herron’s Slough House novels, consists of six episodes and will be released weekly, though reports differ on whether two episodes will premiere on launch day and whether the finale falls on Oct. 22 or Oct. 29.

The new episodes, billed as an adaptation of London Rules, open with a sequence of unsettling events across London that quickly draw Slough House into the investigation. The trailer and producers’ descriptions suggest multiple killings, a lockdown at Slough House and the specter of a coordinated security threat. The plot is sparked by Ho’s suddenly glamorous new girlfriend, a development that prompts suspicion from colleagues and intelligence officials and leaves Slough House wondering whether the personal and the political are connected.

Christopher Chung, who plays Roddy Ho,...