Ted hands out books to the squad and Roy gets Madeleine L'Engle, which he takes about as well as you would expect. He asks what A Wrinkle in Time even is, then reads it to his niece Phoebe anyway. Wikipedia credits the book with pushing him to take matters into his own hands.
Book Riot spots Sam with a worn copy of A Wrinkle in Time in season two, the same title Ted gave Roy. Sam is reading during the stretch when he learns about Cerithium Oil. Roy's book again, which means either Ted ordered a box of them or Roy passed his copy on. L'Engle's heroine takes on a planet run by a giant brain that wants everyone to conform. Sam stood up to the club's sponsor earlier that season, so he already knows the plot.
L'Engle's 1962 novel won the Newbery Medal and has a girl travel across the universe to rescue her father. Roy's version of a tesseract is shouting at a grown man until he shapes up. Same energy, fewer dimensions.