"Thor's hammer is missing again. The thunder god has a disturbing habit of misplacing his weapon--the mightiest force in the Nine Worlds. But this time the hammer isn't just lost, it has fallen into enemy hands. If Magnus Chase and his friends can't retrieve the hammer quickly, the mortal worlds will be defenseless against an onslaught of giants. Ragnarok will begin. The Nine Worlds will burn. Unfortunately, the only person who can broker a deal for...

Junie B. Jones experiences glee while showing off her new furry mittens in kindergarten, but disaster strikes when they disappear from the playground.

At school before Parents' Day, Nancy and Bree are on the case when a prized possession goes missing, and Nancy decides to make her guitar teacher and her favorite babysitter fall in love on Valentine's Day.

Visiting her grandmother in Australia, Livy, ten, is reminded of the promise she made five years before to Bob, a strange, green creature who cannot recall who or what he is.

When a puppy who is being trained as a police dog goes missing, third-grader Judy forms a detective agency to solve the mystery, imitating her literary heroine, Nancy Drew.

A tooth goes missing while Pete the Cat is helping the Tooth Fairy, and he must find it before it's too late.

"Amelia Bedelia loses her tooth . . . and then she loses it again. But it's finders keepers in the end"--

After a class trip to a floating zoo where animals are mistreated and Savannah's missing pet monkey is found in a cage, Long Island sixth-grader Griffin Bing and his band of misfits plan a rescue.

Bear's animal friends come to his rescue when he becomes lost and frightened in the woods.

When Harry, the class pet, gets out while at Amelia Bedelia's school break, Amelia and her friends must find him.