A so-so helping of Jack Ryan

Like many burnt-out CIA agents, Jack Ryan (John Krasinski) wants to be left alone. But CIA agents, don't retire -- not in movies. So at the beginning of Jack Ryan: Ghost War, Jack is lured back into action by his boss, James Greer (Wendell Pierce). Screenwriters Krasinski, Aaron Rabin, and Noah Oppenheim bring the series to a close with a movie that alternates exposition and action in roughly equal measures. Jack's joined by colleague Mike November (Michael Kelly) on a supposedly routine mission turns into a complicated globe-threatening plot that teams Jack with Emma Marlow, a British intelligence agent played by Sienna Miller. Both are trying to locate a rogue agent (Max Beesley) who runs a group that wants to revive Starling, a deep-cover operation that believes dirty fighting is essential if those who would crash the gates of western civilization are to be quashed. Moving from Dubai to London, Ghost War bids goodbye to characters, who -- before the end -- affirm their camaraderie,…