"Gleaming the Cube: Part One of The Unsentimental Education" is an issue of the series Everafter: From the Pages of Fables with a cover date of June 2017. It was published on April 5, 2017.
Publisher's summary
After her role in the Alcatraz catastrophe, Tanner returns home and faces the personal fallout from her professional choices. When her bullied teenage son and his friends discover a stash of Tanner’s leftover mission loot, they weaponize the artifacts and vow to punish their peers. With her son at the helm of his besieged high school, Tanner must swallow her pride and call on the Shadow Players for assistance.