National Book Award winner Robin Benway debuts a coming-of-age middle grade novel about friendships, family, and discovering the person you're meant to be. Babysitters Club meets The Sandlot when twin sisters join a ragtag neighborhood girls softball team at a time when growing up could mean growing apart.

Aggie and Jac might be twin sisters, but lately they haven't felt the same about anything. While Jac is excited about their move to Los Angeles and a chance to seem cool and mysterious, Aggie is worried her new locker won't open, that Jac could make new friends without her, and that her friends from home will move on, leaving her all alone.

When the first day at school ends with an invite to join the neighborhood softball team, Aggie jumps at the chance to meet the other girls, even if she has to drag Jac along, whose own interest in the softball team might have more to do with the captain's older brother...

Aggie is relieved to learn that each girl is dealing with their own problems and becomes excited at the opportunity to create strong friendships. But as Jac and Aggie grow into different people, will they be able to hold on to their sisterhood? For life throws the biggest curveball of all: growing up.