lost and found possessions

When their math teacher sends them to see the principal, two boys risk further punishment by following a new girl who has disappeared into the lost and found bin looking for her lucky hat.

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.

Lizette tries to figure out what to do with the one green sock that she finds while out walking one day.

Molly's school develops a mountain of a problem when she and all her classmates forget to take their mittens home.

When first-grader Roscoe discovers that his stuffed pig is missing from his backpack, he accuses the class bully of "pig-napping" and gets even by taking the bully's teddy bear.

Nate the Great and his dog Sludge look for Annie's house key which has mysteriously disappeared.

When a cow loses her moo, she searches to see if another animal in the barn has it.

Mr. and Mrs. Green, a loving alligator couple, make an attempt at being detectives, enter a gumball guessing contest, and sign up for the town talent show.

The reader is asked to help Nate the Great solve the mystery of his friend Annie's missing dog Fang.

Nate always depends on his dog Sludge to help him solve all his cases, but Sludge is missing and Nate must rely on his own skills to find him.