The Aldens are helping their grandfather organize Greenfield's Winter Festival. When the Boxcar Children get a roll of photos developed, they find a secret message hidden in one of them. They are baffled, and things become even more mysterious when they realize that someone is trying to ruin the Winter Festival by tearing down the decorations and stealing a local statue! There must be a connection between the message and everything that is going wrong.

The Aldens are thrilled to be with their Aunt Jane and Uncle Andy in San Francisco. When they visit Fisherman's Wharf, their friend, Charlie, invites them aboard a fishing boat. But strange things are happening on the wharf, and it seems as if someone doesn't want Charlie to catch any fish. Can the Boxcar Children find out what's going on?

When the Aldens hear that Grandfather's friend Mrs. Ashleigh had an ancestor who was a pirate, they decide to hunt for his hidden treasure. But then strange things start to happen, and it looks like someone else wants to find the treasure - and keep it! Can the Boxcar Children stop the thief before the next hurricane hits?

The Aldens are visiting the Alamo with their grandfather. They arrive at the Alamo to find that a movie is being made there - and they are going to be in it. But then things start to go wrong on the movie set, and a priceless ring from the Alamo Museum disappears. Are the two things connected? It is up to the Boxcar Children to solve this new puzzle

The Aldens are going to visit a guide dog school - but once they arrive, mysterious things start to happen. Benny sees strange lights in one of the dormitory rooms... and late one night, someone breaks into the kennel where the guide dogs are kept. Is someone after one of the dogs? The Boxcar Children are determined to find out!

The Boxcar Children love exploring the train, watching the beautiful scenery from the observation car, and eating in the dining car. But the train ride gets really interesting when they meet a young woman who has had something very valuable stolen from her.

The Aldens are going on a trip to the Arizona desert. There they learn about the legend of the Lost Dutchman Mine. Everyone thinks the mine is filled with gold. Can the Boxcar Children find out if the legend is true - and if it is, who will find the gold?

The Aldens are all on the same soccer team, and know that winning isn't as important as having fun. But is someone trying to ruin the soccer league? Practice balls get deflated, a goalie's gloves are ruined, and a player is locked in the locker room during an important game. What's going on?

The Boxcar Children are going on vacation to Dragon's Mouth Cavern. The four Aldens like rock hunting in the area, until Benny finds a sinkhole that leads to the underground caves. While exploring the caves, they realize that someone doesn't want them there. But why?

Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and they're fixing up their boxcar so they can ride it in the big Greenfield Founder's Day parade. There's just one problem: Someone has stolen the boxcar... with their dog Watch in it! If only they can find the missing boxcar, it will lead them to Watch.

The Boxcar Children try to find the monster that lives in the mountain lake.

The Aldens love exploring the many hiking trails around Yellowstone, especially Lost Cabin Trail. But suddenly the trail is closed because of bear activity, and then the map disappears! Could someone be trying to keep the Aldens away from the trail? It's a mystery - and the Boxcar Children are going to solve it!

The Boxcar children and their grandfather are visiting Hawaii. They help pick pineapples on their cousin Mary's plantation, go snorkeling, and visit a volcano. But they can't figure out why no one will tell them the legend of the black pearl.

The Aldens are so excited when they get to meet other ballonists, learn how hot air balloons work, and even help the crew launch a balloon. Then, things start to go wrong. Someone is trying to ruin the rally, and the Boxcar Children might not get the chance to ride in a hot air balloon after all - unless they solve the mystery in time.

The Boxcar Children and their grandfather are going to New Orleans. The Aldens like exploring the city. Most of all, they like helping Grandfather's friend clean up her old, dusty bookstore. They discover lots of interesting things in the store, especially a beautiful set of fairy tales. But then mysterious things start to happen. One of the books in the set is missing! Someone is after something the Boxcar Children have. Will they be able to solve this new, exciting mystery?