Since coming together at the age of eleven, Nina, Avery and Mel have never been apart. The summer before senior year, however, Nina goes away to a summer program in California. When she returns, she expects to be welcomed back into her friends’ arms with great excitement. Instead, something has changed in the Triangle—Mel and Avery are acting strangely. There are in-jokes Nina doesn’t get, pauses in the conversations that seem to be full of some meaning that she just can’t grasp. She’s suddenly an outsider, and she has no idea why.
Until she wanders into a dressing room and finds Mel and Avery kissing. What exactly do you do when your two best friends in the entire world start dating?