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Arthur is in danger of having to spend the day of the third grade picnic in detention when the quarters he collected to help the fire department buy a new dog disappear, but Arthur's friend Buster Baxter, who is trying hard to be a detective, sets out to solve the case.

Noelle and Todd hope to impress their new third grade teacher by being the first to use his clues to figure out who sent an anonymous note to another classmate.

When he finds a clue to a mystery in his tree house, Todd enlists the help of his third-grade classmates to identify the trespasser who had left it there.

In the midst of a series of unexplained accidents and mysterious coincidences, sixth-graders Calder, Petra, and Tommy lead their classmates in an attempt to keep Frank Lloyd Wright's famous Robie House from being demolished.

Guided by her rules, nine-year-old Allie works to get past being just the new girl at school, eagerly awaits the arrival of her kitten, and faces turmoil when her grandmother visits while the family is still settling into their new home.

Jigsaw tries to recover Eddie's baseball cards which have disappeared in school.

When hired by a fellow fourth-grader to find her missing brother, Chet Gecko uncovers a plot involving a Gila monster's revenge upon the school football team.

Janet and her cousin Herman "Houdini" Foster investigate the mystery of their pet gerbil's disappearance from their classroom.

When fifth-grader Cam notices that the prizes for the most difficult game at the school carnival are rapidly disappearing, she uses her amazing photographic memory to investigate.

Cam uses her photographic memory to help a classmate find the tooth she lost at school.

Chip, an invisible boy, and his friends solve the mystery of who took the school ball from the playground.

Using her photographic memory, Cam Jansen joins Eric in solving the mystery of how some of the school computers were stolen.

Detective Jeffrey Bones finds he does not need fancy equipment to solve the school-lunch mystery of Not Me Amy's missing cupcake.

Sixth-grader Ben Pratt's life is full of changes that he does not like-his parents' separation and the plan to demolish his seaside school to build an amusement park-but when the school janitor gives him a tarnished coin with some old engravings and then dies.

Students from a Rochester, New York, elementary school learn about photography and the steps in solving a mystery when a valuable candlestick is stolen during their field trip to the George Eastman House museum.