Jane Foster and the Mighty Thor #2

When Jane and Odin find a clue steeped in unknown magic, they turn to Doctor Voodoo for help finding Thor - and learn of an interdimensional threat that will require more than Thor's strength to combat. Meanwhile, Rúna cuts a Midgardian vacation short to help the warriors of Asgard hold off their enemies' assault on the Golden Realm. But why do their enemies seem to know something Sif doesn't?