Stella Grant is every bit a seventeen-year-old. She's attached to her laptop and loves her best friends. But unlike most teenagers, she spends much of her time living in a hospital as a cystic fibrosis patient. Her life is full of routines, boundaries and self-control, all of which is put to the test when she meets an impossibly charming fellow patient named Will Newman.

La Llorona is a specter from legend, wailing in the night for her lost children and desperate to claim living children to replace her own. In the 1970s, a social worker deals with a woman charged with child endangerment who is actually a victim of La Llorona, and gets caught up in the supernatural realm herself. Now the only hope for her own children may be a priest who lives on the fringes of where fear and faith collide.