I finally finished this and really enjoyed it!
It's a very character-driven book about (family) relationships, and especially the one between twins Jude and Noah. Once they were inseparable until something drove them apart and they hardly speak anymore. It's written in dual POV and we follow 13-year-old Noah and 16-year-old Jude whilst we try to put the pieces together and figure the story out. In the meantime, they, too, have things to discover and figure out.