The BBC has released the trailer for its forthcoming new suspense thriller set on a sleeper train travelling from Glasgow to London.

The broadcaster has announced that Nightsleeper will arrive on Sunday, September 15, with all episodes available on BBC iPlayer from 6am. On BBC One, the series will air on Sunday and Monday nights across three weeks from 9pm that night. 

Alexandra Roach (The Light in the Hall) and Joe Cole (Gangs of London) lead the cast of Nightsleeper, written by BAFTA award-winning writer Nick Leather (Murdered For Being Different) and made my Fremantle’s Euston Films for the BBC.

Nightsleeper is described as "a real-time thriller set on a sleeper train travelling from Glasgow to London, while a government agency desperately tries to intervene in the rapidly-escalating events onboard".

Nightsleeper also stars Alex Ferns (The Devil’s Hour), Sharon Small (The Bay), James Cosmo (Tom Clancy’s Jack Ryan), David Threlfall (Shameless), Daniel Cahill (The Control Room), Sharon Rooney (Barbie) and Parth Thakerar (Gangs of London).

Penned by BAFTA award-winning writer Nick Leather (The Control Room, Mother’s Day), The series is directed by Jamie Magnus Stone (Doctor Who, Ten Pound Poms) and John Hayes (Dublin Murders). 

READ MORE: BBC commissions new suspense thriller set on Glasgow to London sleeper

Speaking about the series after it was commissioned in 2022, writer Nick Leather said: “I couldn’t be more excited to work with Euston Films and the BBC to drive the engine of this real-time thriller and take our audience along for a ride full of personal intrigue, political manoeuvring and danger. By the time dawn breaks at the end of this journey, no-one involved will ever be the same again”. 

Gaynor Holmes, Commissioning Editor for BBC Drama, added: “Nick Leather’s ingenious scripts combine a fantastic premise with a nail-biting plot and characters you will root for. We can’t wait to bring Nightsleeper hurtling on to the BBC - viewers will definitely want to catch it.”