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These are just some of the 10 brain-twisting mysteries that Encyclopedia Brown must solve by using his famous computerlike brain. Try to crack the cases along with him!

Thirteen-year-old Ben Ripley has had a lot of field success despite only just beginning his second year at Spy School, something graduates rarely experience. But he'd never have survived without the help from experienced agents and his friends. Now he's been called in on a solo mission - and the fate of the United States of America is on his shoulders alone. The mission: Prevent a presidential assassination by infiltrating the White House and locating the enemy operative.

This collection includes K is for Kidnapped, L Is for Lucky, M Is for Mummy, and N Is for Nugget. Someone has kidnapped the king and queen of Socotra. For safety's sake, their son is staying with Dink until they are safe. But then the prince is kidnapped, too! Can Dink, Josh, and Ruth Rose unmask the royals' enemies before it's too late? Or is the royal family of Socotra gone forever?

George and Harold, and their doubles, Yesterday George and Yesterday Harold, have a good thing going. Two of them go to school, while the other two hide in the tree house and play video games all day - then they switch! But it turns out there's something rotten in the state of Ohio, and it's smellier than a pile of putrid gym socks. The boys' malicious gym teacher, Mr. Meaner, has created a method of mind control that transforms their fellow students into attentive, obedient, perfect children.

"Olive Barstow was dead. She'd been hit by a car on Monroe Street while riding her bicycle weeks ago. That was about all Martha knew."

Since we first met Nikki Maxwell, she's been doing everything she can to keep everyone at school from learning the truth - that she's there on scholarship in exchange for her dad working as the school's exterminator. The last thing Nikki needs is having her friends and - worst case scenario - her crush, Brandon, associating her with the humongous roach on top of her dad's van!

In honor of Presidents’ Day, A.J. and Andrea from Ella Mentry will compete against their Dirk School rivals in the ultimate Presidents’ Day Challenge! The winning school will get bragging rights, a free trip to an amusement park, and a top-secret prize. The only problem is that A.J. doesn’t know anything about US presidents, unless it involves their use of toilets! Will A.J. and Andrea be able to work together as a team and bring home the win?

Ever since Grandma Lou gave her that squished penny, Judy can’t stop winning - at bowling, at spelling, at everything! For sure and absolute positive, she’ll ride that wave of good fortune all the way to the nation’s capital. Watch out, D.C. Here comes Judy Moody, the luckiest kid ever! Luckiest, that is, until her lucky penny has an unlucky accident. Suddenly it’s good-bye, Lucky Duck! Hello, C-A-L-A-M-I-T-Y! Has Judy’s luck gone down the toilet for good?

Jackson and his family have fallen on hard times. There's no more money for rent, and not much for food, either. His parents, his little sister, and their dog may have to live in their minivan. Again. Crenshaw is a cat. He's large, he's outspoken, and he's imaginary. He has come back into Jackson's life to help him. But is an imaginary friend enough to save this family from losing everything?

Amelia Jones has always dreamed of attending the Mystwick School of Musicraft, where the world’s most promising musicians learn to create musical magic. Unfortunately, Amelia botches her audition and her dream comes crashing down—until the school agrees to give her a second chance. Amelia vows to do whatever it takes to make her dream come true.

Sophie Foster is ready to fight back. Her talents are getting stronger, and with the elusive Black Swan group ignoring her calls for help, she’s determined to find her kidnappers - before they come after her again. But a daring mistake leaves her world teetering on the edge of war, and causes many to fear that she has finally gone too far. And the deeper Sophie searches, the farther the conspiracy stretches, proving that her most dangerous enemy might be closer than she realizes.

George and Harold are fourth-grade buddies who love practical jokes. When their latest prank drives their science teacher over the edge, their clueless principal, Mr. Krupp, quickly hires a replacement: Professor Pippy P. Poopypants. Of course, George and Harold can’t resist making fun of the Professor’s silly name. But then the Professor retaliates by forcing everyone in town to change their own names to be equally silly - with colossal consequences!

Judy Moody has a double! Amy Namey is exactly like Judy - same-same - and she's a member of the "way-cool" My-Name-Is-A-Poem Club. Judy is meant to be doing an Around-the-World class project with Rocky and Frank Pearl. But with so much time spent thinking about Amy, Judy's old friends start to feel left out...

A hilarious new middle grade novel from beloved and best-selling author Gordon Korman about what happens when the worst class of kids in school is paired with the worst teacher. The Unteachables never thought they’d find a teacher who had a worse attitude than they did. And Mr. Kermit never thought he would actually care about teaching again. Over the course of a school year, though, room 117 will experience mayhem, destruction - and maybe even a shot at redemption.

Ever wish you had a flying robot for a best friend? Wouldn't it be great to have a robot so big and powerful that nobody would ever mess with you again? Friendly robots can be fun! But with giant friends come giant responsibilities. In this book, the evil Victor Von Vulture and his army of Voodoo Vultures from Venus are about to take over planet Earth. Only the super-smart tricks of Ricky and his mighty robot can send the bad guys packing for home!

Two boys - one white, one Indian American - gain strength from each other from afar as they struggle to navigate middle school, family, and friendships.

In this gripping new addition to the best-selling I Survived series, a young Jewish boy joins the resistance "partisan" fighters outside the Warsaw ghetto. Does he have what it takes to survive the Nazis - and fight back?

When Steve's friends, Max, Lucy, and Henry, get their hands on a map with the location of the legendary Mine Mountain, Steve questions if the map is a fake. Going to this fabled mountain, rumored to contain an endless supply of diamonds, is every treasure hunter's dream. Many believe the mountain doesn't exist, and although Steve is doubtful about the map's authenticity, the gang convinces Steve and Kyra to embark on a journey to find this magical mountain.

George and Harold are always good at using their imaginations, and that drives their mean homeroom teacher, Ms. Ribble, crazy! But this time, they’ve come up with much more than a silly prank - they’ve created an actual monster! With her horrendous hairdo and two rabid robots, Wedgie Woman is well on her way to world domination, and only the Waistband Warrior can stop her! The Captain Underpants series is perfect for listeners of all ages. Like the other outrageously funny books by acclaimed author and Caldecott Honor illustrator Dav Pilkey, this adventure is sure to be fun!

Today is Ricky's birthday, and it's off to a great start! After peanut-butter pancakes and presents, Ricky's parents are taking him and his mighty robot to see dinosaurs at the museum. And they have a surprise for Ricky: His cousin, Lucy, is coming with them! Ricky thinks Lucy is a real pest. Suddenly, things aren't looking so sunny anymore. At the museum, there is another surprise in store. General Jackrabbit, an evil genius from the planet Jupiter, is jumping for joy! He has just created three Jurassic Jackrabbits to help him take over Earth.