Perfect on Paper: A Novel

Darcy has two major secrets: she's in love with her best friend, Brooke, and she's the anonymous advice giver behind locker 89. When she's caught in the act of the latter by certified pain in the butt Alexander Brougham, she'll do anything for him to keep her secret and risk losing Brooke for good. In this case, "anything" means helping him get his ex back, which sounds like no big deal...until she realizes somewhere along the way, she started wanting him for herself.