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When the Alden children go camping on Blizzard Mountain, a place said to be inhabited by a ghost looking for buried treasure, they begin to think someone or something is trying to scare them off.

The Boxcar Children investigate when things start to go wrong for the Greenfield Museum right after the institution puts a four-thousand-year-old Egyptian mummy on display.

The Aldens are thrilled to be helping out at Cogwheel Stadium as the Clayton Cogs try to win the pennant, but when the children realize someone has stolen the team's pitching signals and given them to the other team, they set out to find the spy before he ruins the team's chance at victory.

The Alden kids are sabotaged when they compete in a new game show that involves a camera crew following them around Philadelphia as they compete with another brother-sister team in a search for clues.

Seven-year-old Brian enlists the help of his little sister Penny to discover which of his soccer teammates is spreading rude rumors about him.

Henry, Jessie, Violet, and Benny are given the opportunity to be extras in a movie about the Alamo, but they are called upon to use their sleuthing skills when Claire, the star of the film, is implicated in the theft of a valuable ring.

Henry, Jessie, Violet, and Benny, attending an astronomy conference with their grandfather at Mountvale College, become involved in a mystery when a student who is slated to make a presentation about an outer space discovery learns that his research paper has been stolen.

The Aldens visit Grandfather's friend, Abby, at the Ogopogo Retreat, and attempt to help the woman get more business for her resort, even though something is trying to stop them.

Seventeen-year-old Emerson uses her power to manipulate time to help Michael, a consultant hired by her brother, to prevent a murder that happened six months ago while simultaneously navigating their undeniable attraction to one another.

The Aldens investigate when the arrival of several suspicious characters in Greenfield coincides with a mystery involving a popular boy actor.

In 1814, as the War of 1812 threatens her Maryland home, thirteen-year-old Caroline sets out to discover the truth about the disappearance of her older brother.

Curie and Nick Masters follow their mad-scientist father to some of the country's most tornado-prone locations, learning about past tornadoes and the possibility of future ones.

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.

The Alden children investigate when it appears that someone is trying to sabotage their friend professional hockey player Kevin Reynolds's plans to build an ice skating rink in Greenfield.

After the Aldens arrive for the opening of the new game store, someone robs the coffee shop at the end of the mall.