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.

"The Aldens spend the summer on their aunt's ranch! The ranch is a beautiful place, but it's also the source of trouble between Aunt Jane and Grandfather. As the Boxcar Children explore the land, they make an amazing discovery. Will it help mend Aunt Jane and Grandfather's relationship?"--Publisher's description.

Iggy is delighted when Ada Twist's Aunt Bernice inherits a mansion featuring his favorite architectural periods, but unless the Questioneers can find its missing antiques, the house may be lost forever. Includes information about Art Deco and Art Nouveau, facts about unusual cats, a recipe for ice cream, and a biographical note on Ida B. Wells.

One day, Mac (smartest boy in his class in a small town in California) receives a telephone call from the Queen of England, recruiting him to find the crown jewels (well, actually just the Coronation Spoon) and so Mac embarks on his first adventure as a secret agent--with the assurance that the Queen will give him a note excusing him from school.

Nate and his dog Sludge try to solve a case on Halloween night and find themselves locked in a haunted house.

Sofia is put in charge of overseeing a fair election for a class pet, but first the Questioneers must learn about elections and good journalism--and remember that being a community matters most. Includes facts about the Delano Grape Strike, presidential elections, journalism, and the importance of voting.

When Rosamond looks into her crystal ball to read Nate the Great's future, she sees a new case for him to solve-- her money box is missing and she wants him to find it.

"Nate the Great and his dog, Sludge, would like to take a break from solving cases. So they hide out in the woods. But soon they hear familiar voices shouting, "Nate the Great, where are you?" There are many mysteries to solve!"--

As more and more of his flowers display the bite marks of a wandering tortoise, Nate sets out to uncover the mystery of the reptile's origins.

Nate and his dog Sludge are determined to find the recipe for his mother's monster cookies.