While competing in Spirit Week events at school, eight-year-old twins Zach and Zoe follow clues to find Zach's missing baseball, signed by his favorite major league player.

When Nina's antique store burns down, nine-year old reporter Hilde and her sister/photographer, Izzy, are determined to investigate the cause for the Orange Street News--and their main clue is a bird's nest of baby Blue jays.

Jack's person, Sarge, is getting married, and that means a big party, with lots of food! All the dogs are excited, so when the ham for the wedding party is stolen, Jack has plenty of canine suspects.

Relates the exploits of the four Alden children as they locate a missing man. The Boxcar children are determined to solve the mystery that surrounds an old yellow house on their grandfather's property. Strange things have happened in that house where long ago a man disappeared.

While visiting Wallis's castle, Dink and his friends investigate strange noises that lead them to a dangerous secret.

"The president's brother is a catcher on the Nationals baseball team, and someone is stealing his equipment! Can Mike and Kate help the commander in chief catch a criminal?"--

Nate the Great searches for a missing weed after it disappears from a pot on Oliver's porch.

Even a deep snow the week before Christmas can't keep Nate the Great and his dog Sludge from finding the special card sent to Annie's dog Fang by his mother.

Seven-year-olds Bradley, Brian, Nate, and Lucy make observations and gather clues that convince them that their older siblings, cousin, and animals have been captured by hungry space aliens.

Eva Wingdale and her class are excited about their trip to Poppy's Pumpkin Farm, where every year, there is one very large, extra special, thank-you pumpkin. But on the second day of the visit the owls find that the Thank-you Pumpkin has gone missing, and the farm animals are in an uproar--so Eva and the other owls turn detective to solve the mystery of the missing pumpkin.