I'm reading the main Secret Empire comic and it's... fine, but the story is spread out over so many different series, that it's difficult to follow sometimes.
But yeah, SHIELD turned some fragments of the cosmic cube into a girl, which somehow rewrote reality to make Cap a Hydra sleeper agent and exploded and the proper version of him is in some displaced limbo world with displaced versions of Red Skull, Bucky and Falcon and also cube girl. Hydra Cap is trying to reform the cube completely so that he can completely re-write history.
Lots of hijinks ensue. Deadpool is a double agent for/against Hydra who keeps rounding up C-lister supervillains for some reason, New York is stuck in the dark zone with most of the heavy hitters trapped inside, there's a big forcefield over the Earth locking out all the of cosmic superheroes and some of the others, like Vision and Scarlet Witch have been brainwashed one way or another. Also Hank Pym is now Ultron and lives in Alaska and Iron Man is an hologram AI of Tony Stark in an old suit and not actually him. I think Las Vegas got destroyed too?
