When hackers send a train, going from Glasgow to London, hurtling towards death and destruction, two strangers try to stop it before it meets its final destination.

		Episode 1
The overnight train from Glasgow to London is hacked; passengers are trapped on board, including police officer Joe; as the train hurtles towards disaster, Joe manages to make contact with Abby, the cyber security director.

		Episode 2
When the cyber attack on the rail network prevents Abby from seeing the obstacles in the sleeper's path, she realises that she's in race against time to avert disaster; with the so-called Driver being one step ahead, she must think fast.

		Episode 3
Realising that someone on board may be working with the hackers, Joe turns his attention to his fellow passengers, while Abby stuns her colleagues by taking the train off the mainline.

		Episode 4
While Hud's shocking attempt to stop the train his way threatens to end in disaster, Abby is stunned to discover that Joe may be in even more danger than any of them realised.

		Episode 5
As Hud and Miller interrogate Abby, Joe tries to deal with the fallout to the shock shooting whilst deciding whether or not to put his faith in Saj or the other passengers.

		Episode 6
Abby is convinced that she knows how to stop the remaining carriages; however, with Joe out of contact and time running out, it might be too late for those hurtling towards the end of the line.