When Jupiter notices a planet circling a far star, he enlists the other planets in our solar system to send a letter, but soon there is a disagreement on which, exactly, is the exoplanet.

When Alice goes to stay with her grandmother she discovers the magical Darkling Wood, where she meets a strange friend and discovers letters written between a brother and sister during WWI.

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.

In a series of letters, six-year-old Claire and the Tooth Fairy discuss the important matter of her first loose tooth and when it is going to fall out.

A little girl becomes Santa's pen pal throughout the course of one year and learns some interesting facts about polar animals.

"The hilarious tale of an ox who is in love with a gazelle, told in correspondence"--

"Astronaut Clayton Anderson lived aboard the International Space Station--and while he didn't mail letters home, imagine if he did! These letters are full of weird science, wild facts, and outrageous true stories from life in space. Backmatter includes even more information on space, astronauts, and living among the stars"--

"Each day, the old mailman faithfully delivers special letters to the forest animals. But the mailman has never received any letters of his own. Then one day everything changes..."--page [4] of cover.

Fifth-grader Penny writes a series of letters to her future sibling, including facts about their Oakland, California, home, questions about whether their moms will ever marry, and especially that he or she is loved.

In letters to her recently deceased cat Mud, eleven-year-old Lorelei chronicles the ups and downs of her sixth-grade year, during which her parents separate, she gets a part in the school play, and she becomes friends with the cutest boy in her grade.