Red Skull’s spy-ring is discovered within S.H.I.E.L.D.’s inner ranks, but even more pertinent information is missing. Where is Hydra’s nuclear submarine? And will Nick Fury and company uncover the location all too late?

Red Skull’s spy-ring is discovered within S.H.I.E.L.D.’s inner ranks, but even more pertinent information is missing. Where is Hydra’s nuclear submarine? And will Nick Fury and company uncover the location all too late?