In Eagle Pass, Texas, Grace struggles to understand the "echoes" she inherited from her mother—visions which often distort her reality. One morning, as her sister, Mercy, rushes off to work, a disturbing echo takes hold of Grace, and within moments, tragedy strikes. Attending community college for the first time, talking to the boy next door, and working toward her goals all help Grace recover, but her estrangement from Mercy takes a deep toll. And as Grace's echoes bring ghosts and premonitions, they also bring memories of when Grace fled to Mexico to the house of her maternal grandmother—a woman who Grace had been told died long ago. Will piecing together the truth heal Grace and her sister, or will the echoes destroy everything that she holds dear?