Regan’s brother, Liam, lives a double life and Regan is the only one who knows about it. Liam assumes the role of “boy” by day and only reveals his/her true self at night. During those moments of peace when she is trying on new outfits, experimenting with different wigs, and trying various makeup techniques she calls herself Luna. Regan witnesses these moments because they always take place in Regan’s room.
Regan’s own life suffers because of the time and effort it takes to keep Luna’s secret. Regan doesn’t feel like she can invite friends over because Luna might emerge. Regan had one slumber party and Luna couldn’t help but join in the dancing and toenail painting. After that humiliation, Regan vowed never to have people over again.
Regan knows her life isn’t full. She doesn’t have friends, doesn’t date, and her relationship with Luna is pretty much one-sided. She is constantly concerned about Luna’s mood; always wanting to make everything okay. When Regan meets Chris in Chemistry class things start to change for her though. She realizes how much she is missing by only focusing on Luna.
Not only do we get to see Liam transform into Luna; we also get to see Regan transform into a confident young woman. While the ending of the book is hopeful, getting there is sometimes heartbreaking.