BlacKkKlansman (15)

“America will never elect somebody like David Duke president of the United States,” scoffs detective Ron (John David Washington) to colleagues on the force.

Lee, who co-wrote the script, makes abundantly clear his thoughts on history repeating and he bookends his call-to-arms with sickening footage from Charlottesville of a car being driven at speed into counter-protesters, which left one woman dead and many other people injured.

A disorienting opening salvo featuring Alec Baldwin as a tub-thumping white supremacist segues to Colorado Springs.

Ron (Washington) is persuaded to join the local police force as part of a diversity drive.

This doesn’t include visibility because Ron is consigned to the records room, where he suffers abuse from fellow officers like Andy Landers (Frederick Weller).

Eventually, Ron compels Chief Bridges (Robert John Burke) and Sergeant Trapp (Ken Garito) to utilise him in the field and he goes undercover at a local rally organised by Patrice Dumas (Laura Harrier), president of the black student union, who has invited civil rights leader Kwame Ture (Corey Hawkins) to speak to the membership.

Back at headquarters, Ron responds to a newspaper advertisement for new members for the Ku Klux Klan and he impresses local chapter president Walter Breachway (Ryan Eggold).

Ron foolishly gives his own name over the telephone so when the time comes to meet Walter in person, Detective Flip Zimmerman (Adam Driver) poses as Ron and spits out racist bile on cue to perpetrate the deception.

Walter’s second-in-command Felix Kendrickson (Jasper Paakkonen) isn’t convinced but his concerns are overruled when the real Ron develops a telephone friendship with David Duke (Grace), who is due to visit Colorado Springs in a few weeks.

BlacKkKlansman nestles uncomfortable truths in an outlandish narrative, which pays tribute to “the Jackie Robinson of the Colorado Springs police force” as he outwits the KKK from the inside.

Washington and Driver are a groovy double-act and the script strikes a pleasing balance between suspense and humour.

Lee occasionally over-eggs his deliciously tart pudding like his choice to juxtapose climactic scenes of characters chanting “Black Power” and “White Power”.

Sometimes, restraint lands the heaviest blows.