After a whirlwind cross-country move, Harriet and her donut-loving basset hound, Humphrey, have settled into a new life in Grass Valley, California. When Harriet learns that she's going to be a grandma for the first time and get a new suite with room for her salt-and-pepper shaker collection, she can't wait for her best friend, Martha, to come visit so she can share her good news. But adventure is never far away when Harriet is around. After...