A thoughtful novel about two teen-age outcasts, by an experienced Canadian author of books for young people. Libby, 16, and her brother Ian, 13, have a father who still lives by the counterculture's code; their mother, fed up, left five years ago. Libby's response is a desperate effort to conform, while Ian--though he despises being called ""Moonkid""--adjusts by thinking of himself as an alien: above despicable human behavior. When the two enter a new high school, both find their adjustments failing Ian becomes involved in a feud with the class bully, while Libby must deal with the ostracism of her hard-won new friends when her father faces trial for selling pornography. Even their mother's reappearance with an offer of taking them to live with her is less a solution to their problems than another challenge to be faced. Although this lacks a strong sense of its Canadian setting and seems to begin in the middle of its story, Kropp's offbeat characterizations and narrative from alternating points of view involve the reader and carry the story to a rousing finish.