With such a personal arsenal of talent, Kaki King should succeed. But Junior, her sixth album, is a bit of a disappointment. It’s not terrible, but she’s capable of a better, more focused collection. As songs like “Sloan Shore” and “Spit It Back in My Mouth” demonstrate, King is a gifted songwriter and a truly singular guitarist (after all, there’s a reason she won a Golden Globe for Into the Wild’s original score), but her bland vocals and uninspired lyrics tend to undercut each song that uses them. Inspired by spy novels, her lead single, “The Betrayer,” (which might be the worst song on the album), is an attempt at angular punk that tries to turn the idea of infidelity into one of political intrigue. For all its energy and urgency, “The Betrayer” falls as flat as an opener as the angsty, high school journal entry “Sunnyside” does as a closer. The album’s best moments are those in which King plays to her strengths, and her producer, Malcom Burn, allows those strengths to stand on their own (as they do on “Sloan Shore”). Someone also needs to tell King that the espionage concept is kind of lame. (Rounder, www.rounder.com) Jonathan Dyck