Jon (Riz Ahmed) is a New York-based fixer whose clients are corporate whistleblowers who’ve chickened out in Relay. Courtesy of Bleecker Street

Until it goes kerblooey in the last 15 minutes, “Relay” is the very model of a modern genre thriller: Taut, tight, squeezing the maximum of suspense and character detail from the minimum of gestures. No surprise, it’s from Scottish director David Mackenzie, whose filmography is one lean near-masterpiece after another, with the terrific 2016 neo-Western crime drama “Hell or High Water” a standout.

On top of that, “Relay” stars Riz Ahmed, the rare film talent who can hold the screen by doing absolutely nothing, his big, watchful eyes conveying a mind ferociously at work. Ahmed plays “Jon” — it’s almost certainly not his real name — who’s a New Yor

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