The part of third grade Ellen Tebbits likes most is having Austine Allen for her best friend.

Reynie, Kate, Sticky, and Constance investigate when an unexplained blackout engulfs Stonetown.

As she enters middle school, athletic twelve-year-old Lizard is dismayed to see her friends change into weird strangers and struggles with her own transition from tomboy to "girly-girl."

Catholic-schooled seventh-graders Sophie, Margaret, Rebecca, and Leigh Ann help an elderly neighbor solve a puzzle her father left for her estranged daughter twenty years ago.

After a nasty fall, Naomi realizes that she has no memory of the last four years and finds herself reassessing every aspect of her life.

As she starts in the sixth grade, Agnes faces challenges with her old best friend, a longtime bully, a wonderful new classmate and neighbor, and herself.

Three female students from Ashbury High write to three male students from rival Brookfield High as part of a pen pal program, leading to romance, humiliation, revenge plots, and war between the schools.

Now high school juniors, Zoe, Maddie, and Angela continue to share "instant messages" with one another as one of them experiments with marijuana, another gets her first boyfriend, and the third moves three thousand miles away.

A student at New York's most exclusive preparatory school for girls deals with the mayhem of "Sweet Sixteen" birthday parties given by the ultra-wealthy.

A bet about wardrobes between the wealthy Massie and middle-class Claire results in a testing of old friendships, a forging of new ones, and a change for the student body at Octavian Country Day School.