In Song of the Ovulum, a fiery battle between dragons and the military helped Matt and Lauren set their father, Billy Bannister, free from a demonic captor. The demon, however, escaped and kidnapped their mother, Bonnie. During the battle, a portal vortex flung Matt into oblivion, and no one knew where he went. Now, in From the Mouth of Elijah, Lauren and Billy set out on a journey to find Bonnie, hoping Lauren's gifted hearing can track down Bonnie's never-ending song.