If you didn’t catch 2014’s surprise action hit “John Wick,” launching Keanu Reeves right into a Liam Neeson-style career rebirth, it’s OK. Peter Stormare is here to explain “John Wick” to you at the beginning of “John Wick: Chapter 2.” Playing a Russian gangster, he serves as a connection to the prior film, wherein retired assassin Wick killed everyone in sight while avenging his dog. In fairness, the dog was really cute.

Writer Derek Kolstad and director Chad Stahelski are back for the sequel alongside Reeves, brewing up more of that uniquely Wickian magic. The screenplay is once again taciturn, nearly wordless; Wick speaks infrequently, in monosyllables (perfect for Reeves’ stoner intonation), and new co-star Ruby Rose doesn’t utter a word. But the film is noisy, speaking in the whine of motorcycles, rumbling engines, gunshots, knife swipes and text message alerts announcing a bounty on John Wick’s head.

Like its predecessor, “John Wick: Chapter 2” is a symphony of violence, a ballet even, and the visuals are abstracted to the surreal. The camera doesn’t cut often, eschewing the rapid fire editing typical for this genre. In long takes, it methodically follows Wick as he works, smashing and stabbing and shooting. He is talented, but it is work he detests; he’s compelled by his reputation and his skillset into action. Reeves plays the autopilot assassin with a haunted despondency.

He’s a simple man, with a simple life. All he needs are his house, car and dog. Mess with that, mess with him. In the first film, he avenged his dog; now, it’s his house, filled with all the memories of his late wife. It’s a fascinating role for Reeves’ resurgence, and Stahleski and Kolstad play perfectly to his strengths: his quiet, Zen-like power, his just-deadpan-enough line readings that have inspired unintentional giggles throughout his career.

The surreal, stylized orgy of violence reaches its climax in a deliciously meta art exhibit, a hall of mirrors, making for a self-reflective wink at the notion of the mediated image. John Wick’s murderous actions are reflected and refracted at him, and our pleasure in this carnage, our culpability, is reflected on ourselves.

Where “Chapter 2” stumbles is in its plotting. The beauty of the first film was in the simplicity of story married to Reeves’ quiet persona and performance. Avenge the dog — that’s it. This film involves sibling rivalries, long cons, pawns, bounties and double crosses. It ends, then ends, and ends again, extending the exercise far beyond its welcome. It should have taken a note from its star and kept it simple, stupid.

MOVIE REVIEW

“John Wick: Chapter 2”

Grade: B

Starring Keanu Reeves, Ian McShane and Ruby Rose. Directed by Chad Stahelski.

Rated R for strong violence throughout, some language and brief nudity. Check listings for theaters. 2 hours, 2 minutes.

Bottom line: The plot stumbles, but the film does have its good qualities.