A terrifically smart script from up-and-comer Justin Piasecki is the basis for this twisty cat-and-mouse surveillance thriller directed by David Mackenzie, which has an old-fashioned interest in analogue things like trains and the US postal service – and it comes complete with a pleasingly Hitchcockian set piece at a classical music concert. For those who remember Riz Ahmed’s turn in the award-winning 2019 movie Sound of Metal , about a heavy metal drummer who loses his hearing, there is moreover an extra frisson.

Here Ahmed plays a lonely Muslim guy who grew up in the post-9/11 US; a lifetime of suspicion drove him to drink and now he’s in recovery. He runs an illegal and very lucrative specialist service for corporate employees in crooked organisations who wanted to be whistleblowers

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