Nikki Maxwells diary enters her bratty little sisters clutches in this sixteenth installment of the #1 New York Times bestselling Dork Diaries series!

Its almost time for school to start again, and Nikki is a little worriedbut, as always, she has her BFFS to help. Only, it turns out her friends need Nikkis help. Nikki quickly gets overwhelmed and even starts feeling sickwhich is when her little sister, Brianna, takes her chance to steal Nikkis diary! How much damage can Brianna do before Nikki is back on her feet?