Nikki Maxwell's diary enters her bratty little sister's clutches in this sixteenth installment of the #1 New York Times bestselling Dork Diaries series!

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

Rachel Renée Russell is the #1 New York Times bestselling author of Dork Diaries, an international blockbuster series chronicling the life and misadventures of middle school students, Nikki Maxwell and her best friends Chloe and Zoey. With humor and wit, Rachel's books encourage tweens to embrace their individuality and always let their inner dork shine through. The Dork Diaries series has been translated into forty-two languages worldwide and its characters are as diverse as the millions of tweens who read the books. With more than fifty-five million books in print, the series has garnered such honors as two Kids' Book Choice Awards, an NAACP Image Award for Outstanding Literary Work for Children, the Milner Award for Children's Literature, and a Nickelodeon Kid's Choice Book of the Year nomination. Rachel is also the author of a second New York Times bestselling series, The Misadventures of Max Crumbly, which received a Kids' Book Choice Award. Her daughter, Nikki Russell, is the illustrator for both book series. The mother-daughter team has released nineteen consecutive New York Times bestsellers.