Cycler by Lauren McLaughlin
Synopsis: High school senior Jill is “all girl”–except for 4 days out of the month, when she turns into Jack, who happens to be in love with her best friend. Review: Cycler has quite the premise, with Jill literally transforming from girl to boy once a month, right after her period ends. Girly girl Jill wants nothing to do with horny boy’s boy Jack, and has an elaborate ritual to keep memories of his four days at bay. Her mom loathes Jack as well, and…