The end of the world might be sooner than they think. The valkyries secretly hand-select fallen heroes to bring back to Valhalla to prepare for the final battle. While out at a nightclub, Kathy witnesses a valkyrie collect a dying man's soul. Thinking the valkyrie is doing harm, she tries to fight her off, but loses. Back in Valhalla, the valkyries view their lapse in secrecy as a sign that the final battle is beginning. They capture Kathy and bring her back to Valhalla while they rally their army to send into battle. Meanwhile, Samantha is reeling from having told Steven she's a witch. But when she discovers Kathy's gone missing, she puts her strained relationship aside to save her sister, only to end up in just as much danger as Kathy. With the valkyries preparing for war, Samantha and Kathy must prove that they mean no harm in order to return to their normal lives. But the end of the world might be sooner than they think. Valkyrie is the third book in the Coven series, which serves as a prequel series to the Under the Moon series.