" For me, Cycler started out as light teen reading, but the book actually improved as the story went along, becoming much more emotionally complex. High school student Jill has a rare, strange problem where on her monthly cycle, she actually physically morphs into a teenage boy named Jack. This "problem" is stated as rather matter-of-fact in the story, which is fun, but when Jack develops a crush on Jill's best girlfriend, and Jill herself crushes on a boy who admits that he is bisexual, well, things get complicated as Jill tries to hide her secret from her friends (while grappling with confusing emotions inside). And, yay! Apparently there is a sequel being written. "
— Coffeeboss, 1/16/2014