She appears in the sources like a figure glimpsed through a half-open door.The Norse goddess Idunn is simultaneously the most indispensable and the most overlooked figure in the Norse mythological tradition. Without her apples—kept in a casket that only she knows how to open—the gods age, weaken, and die. She is the single point of failure in the entire divine world's claim to immortality. And yet the tradition gives her almost no mythology of her own, almost no agency beyond the act of keeping, almost no voice in the narratives that would be impossible without her.Idunn: She Who Renews is the first sustained scholarly examination of this extraordinary figure—who she was, what she held, what the tradition understood about the relationship between renewal and the one who makes it possible, and why the most important things are consistently the hardest to see.Drawing on Eddic poetry, the skaldic tradition, the saga literature, comparative mythology, the archaeological record of Norse cult practice, and the emerging scholarship on Norse female divine figures, this book examines Idunn across her full range: as the keeper of the apples that define her function, as Bragi's wife and the goddess of the threshold between creativity and vitality, as the figure whose abduction by the giant Þjazi sets in motion one of the Norse tradition's most theologically precise narratives about what the world looks like when its most necessary presence has been withdrawn.The myth of Idunn's abduction and rescue—told in the ninth-century skaldic poem Haustlöng and in Snorri Sturluson's thirteenth-century prose account — is not simply an adventure story. It is the Norse tradition's most concentrated statement about the specific form of catastrophe that follows from the loss of what is most sustaining. When Idunn is taken, the gods do not lose a battle or a kingdom. They lose time. They begin to die in the way that ordinary beings die — gradually, visibly, without drama. The horror is not spectacular. It is simply the world running down.This book follows the argument wherever it leads: into the comparative traditions of the life-renewing goddess across the Indo-European world; into the archaeology of apple cultivation and ritual fruit deposition in Viking Age Scandinavia; into the skaldic kenning tradition's specific ways of encoding Idunn's theological significance; and into the question of what her recovery means for the Norse tradition's understanding of itself—the recognition that the scholarship has been doing to Idunn exactly what the Aesir did: taking her for granted, failing to notice her importance until the absence makes it impossible to ignore.The Hidden Powers of Norse Mythology is a series for readers who want the Norse tradition examined with full scholarly rigor and full literary attention — for readers who know that the most important figures in any tradition are rarely the loudest ones.Idunn is already on her way back. She was never really gone.