Two years after the end of The Way We Go, the debut novel by Roxie Prince, Growth Spurt picks back up with Katie Sterling and her friends as they turn thirteen and enter the confusing era of their lives wherein they are unsure whether to start growing up or to cling tightly to their childhoods.

Katie grapples with her boycrazy peers, and her inability to connect with them. As a member of the Young Debutante Society, she has her "coming out" party to prepare for, but her friendships and her identity come into question as the event approaches.

Michaela's family is in turmoil over her parents' divorce, and she and her brother rebel. Michaela tries to find solace in chaos, but her desire to grow up too fast puts her in a terrible position, leaving her feeling more alone than ever before.

Rachael and Aubrey struggle to find their place in their new dynamic. Aubrey's strong Mormon faith and head-in-the-the-clouds personality separates her from her friends. Rachael struggles to assert herself and form an identity of her own while balancing the excitement of her first, secret, boyfriend.

All four girls have a lot of growing up to do; whether they do it together or not is what they'll have to decide.