Adler, David A

Eric's Grandma Minnie and Grandpa Max keep hearing someone knock at their door, night and day, but find no one there, so Cam tries to solve the mystery using her amazing memory.

When Cam Jansen and her friend Eric uncover a mystery while selling fudge door-to-door to raise money for the local library, Cam uses her photographic memory to foil a crime.

Danny is not sure what to make of Calvin Waffle, a quirky and smart new fourth grader, but when Danny convinces Calvin to use his brain power to help the baseball team, they both have a chance to become heroes.

When Cam and Eric attend the circus with Cam's aunt Molly, their box of popcorn goes missing. Cam and Eric must use their sleuthing skills to find the popcorn before the show is over.

When Sally's entry in the Best Pie Contest goes missing, young Detective Jeffrey Bones looks for clues.

Looks at triangles and how to identify and measure them.

Traces the life and achievements of the architect, bibliophile, president, and author of the Declaration of Independence.

When a neighborhood dog is found injured, T.F. and his partner, Sara, set out to learn who would hurt the friendly mutt.

Using her photographic memory Cam Jansen joins Eric in solving the mystery of a Valentine's day robbery in a hospital waiting room.

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