There are 200+ missing spacefarers after a mysterious accident shuttered the space program designed to find a better planet after humans ruined this one. A near-future story about love and friendship and young idealistic people confronted with a conflict not of their making that may or may not affect the future of their world. Not a hard science book. It does talk about multidimensional universes but isn’t distracting about it. A very human-centric sci fi novel.