A thriller without many thrills...
Though it boasts an impressive cast, “The Black Windmill” is a thriller without many thrills. In what appears an imitation of third-tier Hitchcock, the film stars Michael Caine as MI6 agent Major John Tarrant. Tarrant’s young son David is kidnapped. Unbeknownst to Tarrant, the kidnappers are his own colleagues — McKee (John Vernon) and Ceil Burrows (Delphine Seyrig) — who want the large number of uncut diamonds that Tarrant’s office has obtained. If he doesn’t cooperate, his son will be harmed. Tarrant agrees to go along, all the while searching for his missing son, joined by his estranged wife Alex (Janet Suzman).<br /><br />Despite being directed by Don Siegel (“Dirty Harry”), “The Black Windmill” is a tedious slog with little action, too much talk, a sluggish pace, and a mechanical performance from the star. The kidnapping element and a final scene set at the title windmill are reminiscent of two Hitchcock films — “The Man Who Knew Too Much” and “Foreign Correspondent” — but lack their cleverness. With little humor to liven the expositional scenes, the movie remains disappointingly flat throughout. An attempt at injecting a bit of levity with the character of Cedric Harper (Donald Pleasence), Tarrant’s boss, comes off as forced.<br /><br />The final scene, when Tarrant confronts McKee as he tries to rescue his son, should be a big payoff but is merely ho-hum. The staging is routine, there are no surprises, and the movie simply trails off. Don Siegel had a decades-long career and directed such first-rate films as “The Beguiled,” “Charley Varrick,” and “Escape From Alcatraz.” “The Black Windmill” is colorless.<br /><br />Bonus features on the Blu-ray release include audio commentary, interview with the film’s cinematographer, 6 radio spots, image gallery, and trailers.
The movie title "The Black Windmill (Special Edition) [Blu-ray]," available on Movies & TV, has received an average rating of 4.4 from 293 reviewers. 
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The additional details include the following in key-value format :
 {"Genre": "Action & Adventure", "Format": "Anamorphic, NTSC, Subtitled, Widescreen", "Contributor": "John Vernon, Michael Caine, Donald Pleasence", "Language": "English", "Runtime": "1 hour and 46 minutes", "MPAA rating": "PG (Parental Guidance Suggested)", "Product Dimensions": "0.7 x 7.5 x 5.4 inches; 2.88 Ounces", "Media Format": "Anamorphic, NTSC, Subtitled, Widescreen", "Run time": "1 hour and 46 minutes", "Release date": "December 4, 2018", "Actors": "Michael Caine, Donald Pleasence, John Vernon", "Studio": "KL Studio Classics", "Country of Origin": "USA", "Number of discs": "1"}

Here is a brief synopsis of the title : Screen legend Michael Caine (The Wilby Conspiracy, The Holcroft Covenant, The Whistle Blower) is a British secret agent targeted for death by friend and foe alike in this riveting tale of mystery and suspense directed by the great Don Siegel (Dirty Harry, Charley Varrick, Madigan). This breathless story of international intrigue finds a determined Caine taking up the revenge trail when ruthless gunrunners kidnap his young son and demand a king’s ransom in uncut diamonds for the boy’s release. With each new lead Caine’s chilling quest becomes increasingly deadly as he begins to suspect that one of his colleagues is in league with the merciless abductors. Donald Pleasence (Halloween), Clive Revill (Avanti!), John Vernon (The Outlaw Josey Wales), Joss Ackland (White Mischief) and Catherine Schell (The Return of the Pink Panther) are among those involved in the spine-tingling, high voltage chase that ends at the infamous Black Windmill. One of the many highlights of The Black Windmill is the rousing score by composer extraordinaire Roy Budd (Get Carter, Kidnapped)..