The Aldens must find a way to solve many mysteries, and all before 5:00 p.m. on Tuesday! Strange things are happening in Greenfield where the Boxcar Children live. Stray cats and dogs appear on doorsteps, but the animal shelter is forced to close, and a nice old woman disappears. Henry, Jessie, Violet, and Benny are very worried about Mrs. Newcombe. Is she in danger? Who are the strange men lurking around her house?

The Aldens are going with grandfather to visit his friend, old Cap Lambert, a retired riverboat pilot who lives in a cabin in the woods. To get there, the Boxcar Children take a wonderful trip down the Mississippi in a paddlewheel boat. But when they arrive at Cap Lambert’s cabin, they find some mysterious things are going on. Spooky phone calls, eerie flickering lights, strange dark figures. Is the cabin haunted?

The Alden family is spending sunny days at the shore and summer nights in the mobile home right on the beach! One morning Benny finds a gold necklace in the sand, and a search for its owner begins a trail of clues that leads to Tower House, the strange old mansion nearby. What will the Boxcar Children find there?

The Aldens are helping save an old library that's about to be torn down. If they fix it up, it might be given landmark status! But after all their hard work, it's very clear someone is trying to destroy the library. But who?

The Aldens have found a mystery under their very own roof! When the children found an old journal behind the closet wall in the guest room, they never dreamed it would lead them on a search for valuable coins. What happened to the girl who wrote the journal - and what is she trying to tell them?

The Aldens are making the journey to their Aunt Jane’s house on an overnight bicycle trip. But on their first night, the children are caught in a rainstorm and have to take shelter in an old, abandoned house where a most unusual mystery - a lost dog - finds them!

The Alden children are helping their neighbors build a tree house. From the tree house, the children discover they can see into the attic of the house next door...and they notice a window that not even their neighbors know about! Does the old house have a secret?

It’s an unusual winter vacation for the Alden family when a huge snowstorm traps them in the woods! Luckily, the log cabin where they’re staying is cozy - only there are strange noises in the night and a mysterious code carved into the closet door. The rescue is a long wait for the Boxcar Children, but the cabin is full of secrets.

Henry, Jessie, Violet, and Benny chart a course for China to return the Reddimus Society's fourth artifact! Along the way they meet old friends and make new ones, but a thief threatens to ruin their trip. Then, after an unexpected stop in Thailand, they meet a suspicious man claiming to work for the Reddimus Society. The Aldens wonder if someone close to them is working for the other side. Who can the Boxcar Children trust to help them?

When Henry, Jessie, Violet, and Benny boarded a train to help the Reddimus Society return a stolen treasure, they didn't plan on traveling around the world. But after a close call with the society's archrivals - the Argents - it's now up to the Boxcar Children to return the remaining six artifacts to their rightful homes. As the children travel through Egypt, Kenya, England, and Italy, can they stay one step ahead of those trying to sabotage their plans?