High school senior Olive Preston has always led a quiet life in Latrobe, Pennsylvania—until she discovers she’s part of the Judea line, a bloodline that traces back to King David and Jesus. Destined by prophecy to play a pivotal role in an impending battle between angels and demons, Olive is known as "the Key," though the true meaning of her role remains a mystery.

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Under the guidance of Javan, leader of the Drove—an elite group of warrior angels from the Powers Throne—and Dara, head of the Principalities Throne, Olive begins to develop her newly discovered abilities. Alongside her mentor, Sister Teresa, they work to protect her from the Caligo, a dark force of demons and humans determined to use Olive against the angels. With their help, Olive embarks on a journey to uncover the prophecy’s meaning and prepare for the battle ahead.

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As Olive and Javan grow closer, their bond stirs unfamiliar human emotions in him, putting her boyfriend, Edgar, on edge. Despite the looming threat of a mystical war, Olive and her best friends, Palmer and Lincoln, strive to keep their high school lives as normal as possible.

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Set against the backdrop of Saint Vincent Basilica in the small town of Latrobe, The Key is a journey of betrayal, self-discovery, and trusting one's instincts and heart—all while facing a supernatural clash between mystical beings and deadly demons that will decide the fate of humanity.