The Founders’ Day dance takes Juniper back to 1944. Addie feels on top of the world but a well-meaning mistake threatens to undo all her good work.

Panic ensues in Juniper as everyone searches for Addie and Bonnie. With the bookstore vandalized, Emily’s mum seeks an advantage. Tensions rise between Bonnie's and Addie's parents.

Do Good Books is up for sale and Bonnie is banned from Juniper. But when Addie and her friends find a final clue for the mysterious safe there might be a way to save the shop... and Bonnie too.