When her homing pigeons disappear while her father is fighting in World War I, a twelve-year-old girl suspects a German spy may be responsible With her father in France, fighting in the war, Pam Lowder has the responsibility of taking care of the family's prize-winning homing pigeons on their farm. The birds are special because her father trained them to fly at night so they can bring messages to his family when he's not there. And now a stranger...

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

In 1724, twelve-year-old Rachel and her friend Sally discover a pirates' hiding place on a deserted island near Charles Town, South Carolina, and they suspect it may be connected to the woman who will soon become Rachel's stepmother.

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

In 1776, eleven-year-old Felicity suspects that an amateur naturalist visiting her family's Virginia plantation may actually be a British spy mapping Patriot plantations in advance of British raids. Includes historical information about the Revolutionary War.

In 1918, caring for her family's homing pigeons while her father is away fighting in World War I, twelve-year-old Pam comes to suspect that a mysterious stranger in her small North Carolina town is a German spy.

In the summer of 1935, twelve-year-old Kit Kittredge's dog Grace mysteriously vanishes and Kit tries to figure out who took her and why. Includes information about pets and dog shows during the Great Depression.