In "The Last Child," 13-year-old Johnny Merrimon is haunted by the disappearance of his twin sister, Alyssa. A year on, he's alienated and desperate, clinging to the belief that she's still alive. Risking everything, Johnny delves into the shadowy corners of his hometown on a harrowing quest for truth. As he uncovers hidden dangers, Detective Clyde Hunt, who has been tirelessly searching for Alyssa, tries to protect Johnny. However, when a second child vanishes, the stakes rise. Teaming up with an unlikely ally, Johnny's search unveils dark secrets and leads to startling revelations, challenging his perceptions and pushing him to the brink in his pursuit of closure and justice.