Ed Brubaker has made a big name for himself as one of the best Captain America writers in the last few decades, but that's an epic that requres a healthy knowledge of Marvel continuity to really appreciate.
Instead, check out the four volumes of his creator-owned book Sleeper, a tense tale of superhero espionage. Agent Holden Carver is in deep cover in the most dangerous terrorist organization in the world. Unfortunately, the only person who knows about this is in a coma. His struggle to survive as a good person doing bad things is riveting reading.
