Penny Hartley has big plans for the summer of 1975. Instead of spending time with her family, she plans to make memories with her friends in Moose Creek by picking peaches, listening to her favorite musicians, and having a fun 15th birthday. Her childhood friend, Darren, looks different when she arrives. Darren has gotten taller and has a deeper voice that makes her question their relationship. She is unwilling to risk giving up years of friendship for something more, but she can't shake her feelings for him. Penny's stepdad begins to struggle with his self worth and wants to cut their trip short. Time is running out, but as Penny debates what to do, everyone's favorite band, Jesse Young and the Matches, whips into town, making Penny face the truth of rock and roll stardom, her feelings about Darren, and the bonds holding her family together by a thread.