Outside of Boxton, on a plot of land called Ruby Holler, Tiller and Sairy Morey, a very old couple whose children have grown up and moved away, are discussing their plans for a new adventure. The two decide to foster children, and they adopt Dallas and Florida. Although Sairy, a very kind and trusting old lady, is excited about having children at Ruby Holler again, Tiller - a "crotchety old boot" - is doubtful. The twins enjoy the freedom and adventure they find in the holler, but they're still suspicious and think that Tiller and Sairy will mistreat them the way others have - although their suspicions soon prove false. Tiller and Sairy tell Dallas and Florida they have been planning separate trips, and they want the twins to come: Dallas with Sairy to explore an island, and Florida with Tiller on a rafting trip. All four are uneasy about a separation from their life-long partner, but they don't speak about this. Tiller and Sairy use their "understone funds," underground savings that they've kept for years, to pay for their travels.