Iron Man and Captain America unite when Veronica Eden escapes custody and attempts to use an ancient AI to take over the world. With the assistance of the Paladins, a run-off from the Fifty States Initiative, it looks like an open-and-shut case, until subterfuge and double crosses bring everything Cap and Tony believed into question.
Picking up on plot threads from Derek Landy's Falcon & Winter Soldier mini-series, Cap/Iron Man is a decent little superhero romp, but it has its fair share of problems. There's an overcrowding of characters, with most of the Paladins not really having much to do outside of one-liners and a final issue twist. There's also the fact that neither Cap nor Tony feel like this is a very personal story for them, even if Veronica is an old flame of Tony's - they're kind of superfluous to the story, you could almost swap them out for any other pair of heroes and it'd still be the same story. And as much as I like Veronica Eden as a character, the fact that all five issues are narrated from her point of view and not from Steve or Tony's at any point feels like a misstep.
Despite that, there's some fun to be had here. Landy's dialogue is as snappy and sarcastic as ever, and the moral ideas at the core of the story are worth turning over in your mind for a moment (even if they're the ravings of a nutcase). The artwork from Angel Unzueta is also a highlight, impressive on every page, highly detailed and full of life.
Hardly required reading, but if you read Landy's previous mini-series it's worth checking this one out for some continuation and closure.