Bailey Broadwell and her best friend, Olivia, are going to have the greatest year ever in middle school! Bailey has it totally figured out. All they need to do is follow her foolproof list of ways to make sixth grade epic.

But Bailey's plan doesn't include her aunt and cousin Hannah unexpectedly moving to town.

Though Bailey hasn't seen Hannah since they were little, she sets out right away to make her cousin feel welcome. And right from the start, Hannah and Bailey seem to enjoy similar things. Only, it's a little strange how Hannah likes everything that Bailey does. And it's weird when Hannah starts joining all the clubs that Bailey's in. Soon she starts dressing like Bailey. And agreeing with everything Bailey says!

Bailey tries not to let Hannah's copycat behavior bother her, until it seems like Olivia and the rest of Bailey's friends like Hannah more than her.

How can Bailey have the best school year ever if Hannah is taking over her life?