Steve Rogers/Captain America, Natasha Romanoff/The Black Widow and Nick Fury are battling HYDRA, a sinister organization that has infiltrated SHIELD. They also have to battle a new and dangerous enemy, The Winter Soldier. They receive help from a new ally, Sam Wilson/The Falcon.
The plot is especially well-written...there are several twists relating to who they can or cannot trust, and the real identity of the Winter Soldier. There is a lot of action, and some violence, but it was a level appropriate to the story, not gratuitous, as is so common today.
Chris Evans was good as Captain America and Scarlett Johanson was good as Natasha Romanoff, but the outstanding acting belongs to Anthony Mackie as Sam Wilson/The Falcon and Robert Redford as Alexander Pierce. I even wish Mackie had more scenes.
One of the better movies I've seen this year. It is both entertaining and captivating.