The Slough House gang are on the run in the trailer for Slow Horses Season 6.

A new trailer for darkly comic Apple TV spy thriller shows Jack Lamb’s (Gary Oldman) team embroiled in Diana Taverner’s (Kristin Scott Thomas) fatal high-stakes game of retaliation and revenge.

“I cannot emphasize this enough: Stay dark, yeah? No phones,” he shouts. Cue a hard cut to computer hacker Roddy Ho (Christopher Chang) calling Lamb via cell. “What don’t you understand about going dark?” shouts Lamb.

The trailer also provides one more big surprise: The return of Olivia Cooke as disappeared MI5 agent Sid Baker, who is seen waiting for waiting at the top of a flight of stairs. “Hello River,” she says with a smirk as Jack Lowden’s River Cartwright stops dead in his tracks. Sid was last seen at the end of Season 1.

Adapted from Mick Herron’s Joe Country and Slough House novels, the six-episode Season 6 will also star the likes of Saskia Reeves, Aimee-Ffion Edwards, Rosalind Eleazar, Joanna Scanlan, Samuel West, Ruth Bradley, Tom Brooke, Jonathan Pryce, Hugo Weaving and newcomer Lenny Rush.

The season launches on September 16, just under a year after the debut on Season 5, which garnered nine Primetime Emmy nominations.

Slow Horses stars Oldman as Lamb, a brilliant but cantankerous leader of dysfunctional spies who have made career-ending mistakes and end up at a dumping ground MI5 unit known as Slough House.

See-Saw Films makes the show for Apple TV, with with Jamie Laurenson, Hakan Kousetta, Julian Stevens, Iain Canning, Emile Sherman, Adam Randall, Gail Mutrux, Douglas Urbanski and Oldman serving as executive producers. Co-executive producer Gaby Chiappe has adapted the season, with Adam Randall returning to direct.

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