The last few years have seen an uptick in pop culture stories featuring time travel, from the repetitions and revisions of "The Good Place" and "Russian Doll" to developments in "Game of Thrones," "Star Trek: Discovery" and "Avengers: Endgame." Sometimes the MacGuffin by which we get to play with anachronism, but often also rooted in questions of free will and determinism, time travel is a fascinating springboard for fiction: Are there many futures, or just one? Can you change the past without changing the future, or yourself? This column brings together books about time fractured and out of joint, time as an unbroken lineage resisting empire, and time travel glimpsed through the overlapping lenses of psychology, philosophy and physics. Kameron Hurley's THE LIGHT BRIGADE (Saga, $26.99) is based on her 2015 short story of the same name, fleshing out the high-concept skeleton of a story about soldiers who are literally broken into light in order to teleport them to different theaters of war.