The adventures of the four Alden children as they investigate a mystery that took place in the yellow house on Surprise Island many years before.

When the Aldens spend the summer riding on a train, they get to live in a train car once again - this time, they're staying in Caboose No. 777. The number is hard to forget, and indeed, the children meet people at each stop who seem to know it well. It turns out Caboose No. 777 has an unusual past - one that comes with its very own mystery!

Six children help solve the mystery of a missing spyglass that has kept two brothers feuding for years.

When Annie tells him about her missing painting, Nate the Great and his trusted companion, Sam Spade, set out to investigate, gather clues, and solve the mystery.

Renting a lighthouse is unusual, but even more so is an unfriendly boy's peculiar behavior.

Mike Wood presents many strange happenings for the Alden children to solve when they spend the summer at Mystery Ranch.

"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." --

When Rosamond's birthday gift for Nate disappears from her sled, the boy detective decides to unravel the mystery.

The Boxcar Children are spending the summer in an enormous New England farmhouse. There's an old woodshed near the house that holds a surprising secret--a secret that dates from the Revolutionary War. Suddenly their summer becomes an adventure.

The orphaned Alden siblings travel to Egypt to return a lost artifact to its rightful location.