Nate the Great solves the mystery of the missing picture.

The children and their grandfather spend the summer traveling on a train--in their own caboose.

The children, who are spending the summer in a lighthouse on the New England coast, are disturbed by a mysterious woman walking the lighthouse grounds. Jessie's dog Watch wakes up growling almost every evening at midnight, and Henry finds a puzzling note in the sand.

Grandfather and Aunt Jane haven't spoken for years, but the children help them to once again talk to each other.

What will the Aldens discover on a vacation to a deserted island? Adapted from Gertrude Chandler Warner's story of the same name, this early reader allows children to start reading with a Boxcar Children classic.

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.

Bradley, Brian, Nate, and Lucy follow clues to find whoever left a rabbit in their first-grade classroom on Valentine's Day, because they are worried the rabbit will get sick and die of loneliness.

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.

When Nina's antique store burns down, nine-year old reporter Hilde and her sister/photographer, Izzy, are determined to investigate the cause for the Orange Street News--and their main clue is a bird's nest of baby Blue jays.

Someone has been stealing and leaving behind little green sneakers, so Bradley, Brian, Nate, and Lucy trail their new teacher, who wears the same shoes in normal size.