Seventy Two Hours: The Valkyrie Chronicles, Book 4

Upon hearing news of the destruction of the Ragnarok civilization by the Frost Giants of Jotunheim, the Valkyrie, Kara, and the combined races must prevent the same fate from befalling Folkvangr.

The invention of the Bifrost may hold the key to Valhalla's survival. Secrets are revealed, and unexpected friendships are formed.