The following is solicit text from Marvel:

What if your greatest ally was secretly your greatest enemy? What if the most trustworthy, stalwart hero in the Marvel Universe was planning in secret a massive betrayal? That time is now, and no one will see it coming. Nick Spencer, Daniel Acuna and Rod Reis present the prologue chapter of this summer's big crossover event. Witness Hydra’s first move as the dominos begin to fall and war erupts on three fronts. To stem the coming darkness, it will take everyone: Avengers, Champions, Guardians, X-Men and more. United they stand against a common foe, but will they stand a chance? 

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