In this trilogy closer, a girl must learn how to harness both her dark and light energies if she's to save her communityUmbra tamer and Lightcaster Mia is mourning the death of her father, who sacrificed himself to seal a portal that allowed the Reaper King to enter the mortal world. Mia and brother Lucas channel their grief into action, using their powers to awaken their grandparents from the unconscious state that Queen Katiya put them in. The Reaper King is now roaming around Lunis, attempting to free Ria, his sister, from the queen's clutches. Mia's friends try to comfort her, but her shame over her inability to save her father continues to isolate her. Mia and Lucas work together to translate the Lightcaster book. They also find out that Mia can connect with other Lightcasters while both sleeping and awake, including Ria, and Mia's best friend, Miles, who's being controlled by the Reaper King. In past battles, Mia's impulsive nature and poorly managed powers hurt other tamers; now she'll have to learn how to be part of a team if she wants to defeat the Reaper King. Readers will enjoy the fantasy quest aspect of the story, and the exploration of grief and its impact will resonate. Mia grows over the course of the story arc and remains an engaging character in this strong end to a series centering on a Black cast.A thrilling adventure that takes readers on an emotional roller coaster. (map)(Fantasy. 9-13)