Henry, Jessie, Benny, and Violet Alden meet Mike Wood and a strange chain of events begins. Mike's house is mysteriously burned down, a man in a blue hat appears, and the Alden's uranium mine is in danger of being sabotaged. The four youngsters solve the mystery.

The Boxcar Children are spending the summer in an enormous New England farmhouse and the old woodshed holds a surprising secret that dates from the Revolutionary War.

The Alden family, snowbound in a vacation cabin, discovers adventure in surrounding wild life, three children they find in the snow, and a search for a lost recipe.

Henry, Jessie, Violet, and Benny hav3e promised Grandfather a vacation from mysteries during their island visit. But the romise proves hard to keep when things start to go missing. Then an old fisherman tells Benny of the island's ghost horse, and late that very night benny sees a mysterious stallion galloping down the beach. Could the ghost horse have something to do with the disappearances?

While Tate Radison was filming his last movie, a lot of odd things happened. Now Tate wants to keep his presence in Greenfield a secret to avoid many more mishaps. But trouble follows him.

The Aldens investigate the rumors of ghosts, disappearing props and a haunted seat in the Trap-Door Theater.

The Aldens visit a farm that's famous for its corn maze and the festival held there every year. But someone is damaging the maze at night. Can the Boxcar Children catch the culprit and save the festival?

The Boxcar Children are going to a dog show. They meet all kinds of dogs, from a spotted Dalmatian to a big, hairy sheepdog. But then strange things start happening at the dog show, and no one knows why. Can the children solve the mystery and save the day?

Strange things are happenikng at the Wagner Farmhouse, and the Aldens' new friends are being blamed. Is the house haunted by the ghost of practical joker Horace Wagner? Or is someonme trying to destroy the museum's chances for success?

The Alden family rents a houseboat to drift down the river, and encounters a mystery in the little towns along the river, involving a fast black car.