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Susan, eleven years old in 1914, encounters a mystery through an independent-minded female boarder and becomes involved in the growing suffrage movement in New York City.

The Alden children, spending the summer in a lighthouse on the New England coast, notice strange things are happening after dark and decide to investigate the mystery.

Fourth-graders Drake Doyle and Nell Fossey combine their detective and scientific investigation skills to solve a variety of cases, involving a noisy garbage can, endangered frogs, a stuck truck, and a mysterious love letter.

Seven-year-old Tessa and ten-year-old Cameron daughters of the first female president, and owners of a very rambunctious dog, play detective when a baton belonging to the director of the Marine Band goes missing at the White House.

KC and Marshall run across a forgotten cubbyhole while painting a closet at the White House and find a box of toy horses that once belonged to Thomas Jefferson; when they go to Monticello to return the horses, the box disappears, and they explore the building and grounds to find the thief.

The Thea sisters are off to Japan on a cultural exchange program and while they're busy exploring Kyoto and admiring the beautiful cherry blossoms, a valuable item is stolen from their friend Kumi's family.

Bradley, Brian, Nate, and Lucy visit a haunted hotel on Halloween, but once inside they realize that they have seen plenty of people going in and none coming back out.

When thirteen-year-old Sammy finds herself with an abandoned baby on her hands, she sets out to find the young mother, who may belong to a gang, and accidentally jeopardizes her position on the softball team.

Nancy's class is hatching chickens to celebrate the coming of spring, but when the chicks turn up missing, Nancy steps in to solve the mystery.

While on a ski trip, Nancy, George, and Bess find themselves wrapped up in another mystery when the ski supply room is ransacked and Bess becomes the prime suspect.

Two mystery stories written by Sir Arthur Conan Doyle in graphic novel format including "The Adventure of the Speckled Band" and "The Boscombe Valley Mystery.

Nancy and her friends are going to perform in a ballet version of Cinderalla, but when the special glass slippers disappear, Nancy is on the case.

Christina and Grant, while on a trip with their grandparents to Niagara Falls, discover mysterious barrels tumbling down from the falls.

While on a school field trip to New Orleans, sixth-grader Catalina Duran becomes wrapped up in a mystery when someone attempts to sabotage their trip and Catalina must uncover the culprit.

Self-proclaimed goofballs Jeff, Brian, Mara, and Kelly investigate the disappearance of rich Randall Crandall's horse, Thunder.