Five magical warriors on a deadly mission. Two imprisoned, one fatally wounded, and two trapped outside. Can they use their unique magic in new ways to escape, survive and succeed in their mission? Split up freeing abducted humans in the Underworld, the five Asters will have to use their magic in ways they didn't even know was possible, to have any chance of successfully completing their mission and quelling the rebellion of Mitrik, the Dark King of North America. Matu has to trust Nathan that his magical abilities can find their brothers and sister in the Underworld and keep Lian alive until he can be rescued. Sky has to rely on Sophie's creative thinking to get them out of Mitrik's magical dungeon. And even if they succeed, there are still Mitrik's Disciples to face down, led by the fearsome Kali. A Threat To Remain is the last in a YA fantasy prequel trilogy featuring siblings in magic - Nathan, Sophie, Lian, Matu, and Sky - in the deadliest adventure of their lives. Join the Asters as they fight to stay alive and take down the North American King.