"Thanks to the events of Original Sin, the deepest secret of the Nine Realms has been revealed: namely, the existence of a Tenth Realm! Now, Thor and Loki must embark on a quest to discover this strange new world--and to discover the sister that Thor never knew he had: Angela! But can Loki be trusted? And will brother and sister murder each other before the truth comes out?"--From publisher.

"Contains material originally published in magazine form as Original sin #5 (1-5.5)"--T.p. verso.