Mallory has a new diary, and big news to write in it: a cute fifth-grade boy LIKES her! The only problem: Mallory's friends are more excited about it than she is. Mallory's not sure what to do, what to say on the phone, or even how she feels. Her best friend, Mary Ann, however, is sure about what Mallory should feel and do. But when Mallory follows Mary Ann's advice, she winds up hurting another friend—and gets in BIG trouble. Can Mallory make things right and learn to follow her own heart?

Mallory has a new diary, and big news to write in it: a cute fifth-grade boy LIKES her! The only problem: Mallory's friends are more excited about it than she is. Mallory's not sure what to do, what to say on the phone, or even how she feels. Her best friend, Mary Ann, however, issure about what Mallory should feel and do. But when Mallory follows Mary Ann's advice, she winds up hurting another friend-and gets in BIG trouble. Can Mallory make things right and learn to follow her own heart?

After Mallory finds out that a boy in her class likes her she takes Mary Ann's advice and lies to her friend April about the reasons why she can't go to April's birthday party, only to land in big trouble when April finds out the truth.

Mallory is on a mission. Max, her brother, is spending all his time with his girlfriend and won't allow Mallory around for ANY of it. Mallory wants to know what's going on when they're together. Are Max and Winnie hatching secret plans? Are they causing danger? And as Max's sister, doesn't she have the right to know? Mallory McDonald, Super Snoop, is determined to spy on them. But when she digs up the dirt she's looking for, she'll find that snooping is messy business!

Mallory's new neighbors, the Goldmans, have twin five-year-old boys who need babysitters. Mrs. Goldman hires Mallory and her friend Chloe Jennifer to watch the boys while she works from home. Mallory can't wait! The boys are adorable, so this job will be tons of fun . . . right? Actually, the boys turn out to be a handful. Plus, Mallory has trouble balancing her babysitting duties with her schoolwork, friends, and preparation for an upcoming school poetry slam. Will she figure out how to prioritize the things that matter the most before her new career ruins her life?

Mallory is turning 10, and she's planning a super sleepover! To celebrate her tenth birthday, Mallory wants to have the most super sleepover celebration ever! Mallory plans out everything to the last detail. As long as she promises not to let the fun get out of control, her parents agree to letting her friends sleep over. But Mallory’s best friend, Mary Ann, has her own ideas about what a super sleepover party should include. Before Mallory can put a stop to things, uninvited guests show up, a water balloon fight gets out of hand, and a good friend has her feelings hurt. How did a super sleepover turn into such a super mess?

Mallory McDonald has four big problems. Problem #1: The boy she likes doesn't like her back. Problem #2: Her brother is mad at her. Problem #3: Her dad is upset about her math grade. Problem #4: Her brother's dog won't leave her alone, and he smells terrible! When it comes to boys, brothers, dads, and dogs, only one thing is certain: Mallory is about to become an expert! A NOTE FROM MALLORY MCDONALD: Welcome to my official guide to boys, brothers, dads, and dogs. Hopefully, it is not the only guide available because THESE ARE FOUR VERY COMPLICATED TOPICS! But lately, I have learned a lot about all of them. So if you want to know what I know, just open up this book and start reading.