Between US and the Moon By Rebecca Maizel.

 

Ever since Sarah was born, she’s lived in the shadow of her beautiful older sister, Scarlett. But this summer on Cape Cod, she’s determined to finally grow up. Then she meets gorgeous college boy Andrew. He sees her as the girl she wants to be. A girl who’s older than she is. A girl like Scarlett.

Before she knows what’s happened, one little lie has transformed into something real. And by the end of August, she might have to choose between falling in love, and finding herself.

Fans of Jenny Han and Stephanie Perkins are destined to fall for this story about how life and love are impossible to predict.