The discovery of Harriet's secret journal, concerning the personalities and activities of her schoolmates and neighbors, causes pandemonium.

Nancy and her friends, George and Bess, are returning from a country carnival when they witness the explosion and burning of a beautiful country mansion. Fearing its occupants may be trapped in the blazing building, they rush to the rescue - and unexpectedly fund themselves confronted with a mystery that seems to be insoluble. The first clue, an anonymous diary, includes not only indecipherable handwriting, but puzzling technical drawings and chemical...

Thirteen-year-old Mary Lou grows up considerably during the summer while learning about romance, homesickness, death, and her cousin's search for his biological father.

In her diary, twelve-year-old Amber describes moving to Hawaii in 1941 and experienceing the horror of the bombing of Pearl Harbor.

In Queens, New York, in 1969, twelve-year-old Julian Twerski writes a journal for his English teacher in which he explores his friendships and how they are affected by girls, a new student who may be as fast as Julian, and especially an incident of bullying.

When a fourteen-year-old baseball player catches mononucleosis, he discovers that keeping a journal and experimenting with poetry not only helps fill the time, it also helps him deal with life, love, and loss.

An instant #1 USA Today, Wall Street Journal, and New York Times bestseller! 
In Wrecking Ball, Book 14 of the Diary of a Wimpy Kid series—from #1 international bestselling author Jeff Kinney—an unexpected inheritance gives Greg Heffley's family a chance to make big changes to their house. But they soon find that home improvement isn't all it's cracked up to be.
Once the walls come down,

...

A fourteen-year-old indentured servant keeps a journal of his experiences on the Mayflower and during the building of Plimoth Plantation in 1620 and 1621.

Taking advantage of a severe drought and the long-standing distrust between two tribes, the demonic Saint Dane attempts to take over Loor's home planet of Zadaa, opposed once again by the teenaged Pendragon and other Travelers.

Thirteen-year-old Madeline's diaries for 1941 and 1942 reveal her experiences living on Long Island during World War II while her father is away in the Navy.