Mrs. LaRue takes a cross-country drive with her hospitalized neighbor's cats and her own dog, Ike, who keeps the cats' owner informed of their misadventures through a series of postcards.

Buster goes away for a month, and Arthur becomes sad and confused when he does not receive even one postcard from him.

When his father takes him to visit Florida, Buster sends postcards to his friends back home telling them what he is learning about surfing.

Buster sends postcards to his friends back home when he goes to Oregon and learns about pumpkins.

When his father takes him to visit Boulder, Colorado, Buster sends postcards to his friends back home sharing what he is learning about the Rocky Mountains and rock climbing.

Stringbean describes his trip to the west coast in a series of postcards.

While in St. Petersburg, Florida, to help clean out his recently-deceased grandmother's house, thirteen-year-old Jason finds an old postcard which leads him on an adventure that blends figures from an old, unfinished detective story with his family's past.