"What is the most important thing in your life?" asked Nesta. "And you have to tell us the truth, the whole truth, and nothing but the truth."

"Easy," said TJ. "My mates. Yeah, my family and my dog, Mojo, too, but mainly my mates."

"Arrrr," chorused all the girls.

Big changes are coming for Cat: post-high school plans, a big move, and her dad is finally getting remarried. But despite having looked forward to the changes, now Cat's worried about letting go of her old life -- and saying goodbye to her home.

Cat's friends come to the rescue and organize a sleepover. While playing truth or dare, the friends promise to always be there for each other -- no matter what happens in their lives. And as plans for the move and the wedding take shape, Cat learns that the more things change, the more the important things stay the same.