As our story opens, Cage is bemoaning the lack of publicity his heroic feats get, compared to other heroes. (Given that he's literally a hero for hire, selling his services to people in need, this is naturally a serious marketing problem.) He thinks it's because he doesn't have a superhero code name, and tries coming up with one. As he ponders this, he's paid a visit by Orville Smythe, who works for millionaire industrialist Tony Stark (the still-secret alter-ego Iron Man, Stark's "bodyguard"). Stark has developed a new suit designed for space exploration, and is apparently worried about how well security at Stark Industries can protect it. So Smythe hires Cage to sneak into Stark Industries to try and steal the suit as a secret test of said security, a test which only he and Stark will know about. Cage is skeptical, but the promise of a sizable paycheck persuades him.
To wrap things up, Luke Cage, Power Man #17 is a great showcase for Cage as a character, and a fun romp for people who enjoy hero-vs.-hero battles. Finding it at an affordable price won't be easy, but it will be well worth your efforts if you can.