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.

"Celebrate the fun that grandparents and grandkids can get up to in this action-packed undersea adventure--a companion picture book to Paul McCartney's bestseller Hey Grandude"--

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.

When his father takes him to visit a national park about dinosaurs, Buster sends postcards to his friends back home telling them what he is learning.

When his father takes him to visit Vermont, Buster sends postcards to his friends back home telling them what he is learning about maple syrup and the "mud season."

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.

"Who is Gretchen Oyster? The discovery of a series of mysterious handmade postcards distracts Hartley from trouble at home. A poignant novel for fans of Rebecca Stead and Holly Goldberg Sloan. Hartley Staples, near-graduate of middle school, is grappling with the fact that his older brother has run away from home, when he finds a handmade postcard that fascinates him. And soon he spots another. Despite his losing interest in pretty much everything...