John Krasinski as Jack Ryan, in “Tom Clancy’s Jack Ryan” TV series, Season 4. Courtesy of Amazon

“Tom Clancy’s Jack Ryan” Season 4 brings another batch of challenges for the eponymous CIA super-agent who headlined a series of novels by Tom Clancy before starring in successful films, and, since 2018, three season of streaming adventures. This next season draws the TV series to a close with this fourth and final season-long, globe-trotting thriller. Fans of any or all of the preceding Jack Ryan iterations will not be disappointed with John Krasinski’s continuing portrayal of their hero, or the six-episode plot-line he navigates.

As usual, there’s a huge conspiracy afoot threatening the world we know, with the action alternating among far-flung arenas of action, and plenty of questions as to who (other than Ryan) is on which side of the crisis. The series opens by showing Jack being subjected to “enhanced interrogation,...