Hawkeye faces Hell itself in a double-sized adventure that also sets up this year's AVENGERS Annual! What mysterious message did Mockingbird have for Hawkeye in AVENGERS #11? That's the big question, as Clint Barton and Hellstorm make an assault on the Netherworld of Mephisto to free the soul of the brash bowman's dead wife! Will the Thunderbolts brave eternal damnation to help their leader? And if they do, what bargain will they have to make with a classic foe to obtain passage across the threshold of life and death?