When a new dino-pup arrives, big sister is reminded of some important things, from being quiet in the morning to playing with him gently.

The Boxcar children have dinner at a Chinese restaurant and get a handwritten riddle in a fortune cookie! One riddle leads to another, and the children wonder who is leaving them the cookie clues, and why?

Left in the care of his older sister, a boy begs her to read his favorite book but she is too absorbed in her own reading even to notice when a tiger comes to life in the steam from his soup.

Having to take her younger sister along the first time she is invited to a birthday party spoils Rubina's fun, and later when that sister is asked to a party and baby sister wants to come, Rubina must decide whether to help.

The Aldens try to help a visiting Russian gymnast who is surrounded by mysterious people and events and who seems to have a secret.

When Grandfather's friend Charlotte bought a mysterious mansion known as Skeleton Point, she invited the Alden children to help her fix it up.

When Grampie Groundhog decides to retire from forecasting the weather, he has twins Greta and Gregory draw straws to see who will take over the important job, but the winner is so nervous the two put aside their squabbling and work together.

When a local radio station holds a detective contest, the Aldens enthusiastically sign up, but when some of the clues turn out to be fake, they have a real mystery on their hands.

When the Aldens help a friend of their grandfather's to build the world's largest yo-yo, they soon discover that more than one person is trying to prevent them from finishing the job--and for more than one reason.

Jack and Annie visit the Paris World's Fair of 1889 in an effort to protect four scientific pioneers from an evil sorcerer.