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.

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?

Looking forward to a family road trip to the Grand Canyon, Mallory's excitement dwindles when she finds out that her snobby cousin Kate will be coming along.

When her best friends Mary Ann and Joey get caught up in the excitement of having a new baby brother, Mallory feels left out.

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 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 is in Washington, D.C. with her fourth grade class. She can't wait to see the famous monuments and museums. But from the moment she sets foot in the nation's capital, there's one thing she doesn't see much of . . . her best friend. Mary Ann is spending so much time with the new boy in their class, she's forgotten all about being partners with Mallory. And when Mallory wanders off to wiggle her loose tooth, her tooth isn't the only thing that is lost! Will Mallory's trip to Washington turn out to be one she'll always remember or something she'd rather forget?