David Adler

Here are two mean and nasty words: Mrs. Cakel

Something has gone wrong in Danny and Calvin's fourth-grade classroom—out of the blue, Mrs. Cakel has transformed from a rampant rule-enforcer to a quiet excuse-accepter. Has she been replaced with an alien? Has she undergone a top-secret personality makeover?

Danny and Calvin decide there's only one way to find out what's really going on—spy. But spying soon leads to

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When Cam's grandparents are robbed on their way to her parents' surprise birthday party, Cam uses her photographic memory to solve the mystery.

No mystery is too great for super-sleuth Cam Jansen and her amazing photographic memory!
Mysteries follow super-sleuth Cam Jansen everywhere she goes...even to a park with U.F.O.s in sight! Cam and Eric see flashing lights in the sky, and everyone thinks aliens have landed. But Cam knows there's more to it than meets the eye. Can she solve this unearthly mystery?
The Cam Jansen books are perfect for young readers who are making the

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No mystery is too great for super-sleuth Cam Jansen and her amazing photographic memory!
Mysteries follow super-sleuth Cam Jansen everywhere she goes...even to a book signing. Cam is waiting in line for a book "pawtograph" from famous TV dog Poochie when he mysteriously disappears and is replaced with an imposter! Can Cam find the real Poochie? 
The Cam Jansen books are perfect for young readers who are making the transition...

On her first day of fifth grade, Cam Jansen uses her photographic memory to help the police find a car thief. Includes a memory game.

Cam's photographic memory helps a scatterbrained substitute teacher, especially when he discovers that he has misplaced his coat.

No mystery is too great for super-sleuth Cam Jansen and her amazing photographic memory! 
Can Cam help catch the diamond thief? Cam and her friend Eric are sitting at the mall when the jewelry store is robbed. Cam sees the thief, but the police arrest the wrong person. Now it's up to Cam to catch the real criminal!
The Cam Jansen books are perfect for young readers who are making the transition to chapter books, and Cam is a spunky...

Fractions, decimals, and percents are everywhere! Just take a stroll around a county fair. There are reactions at the pie-eating contest, decimals in the arcade, and percent signs in the prize booth. Each time you see a fraction, decimal, or percent, youcan easily convert it into its equivalent. This entertaining picture book is sure to earn 100% from math students and teachers.