Contemporary realism, set askew, is the silver streak of Zevin, whose Elsewhere (2005) depicted a teen's experiences in the afterlife. This equally sensitive, joyful novel, her second for YAs, tackles the slippery nature of human identity, deceptively tucked within a plot familiar from TV soaps. After high-school junior Naomi conks her head, she can't remember anything that happened since sixth grade. She is by turns mystified and startled by evidence of her present life, from the birth-control pills in her bedside table to her parents' astonishing, rancorous split. Eventually, the memories return, leaving Naomi questioning the basis of a new, intense romance, and wondering which of her two lives, present or former, represents her most authentic self.
