Near the Canadian border, they stopped at a gas station papered with tourist advertisements. Katelina studied one for Niagara Falls. Her childhood was colored with her mother's dream of an "American Vacation." Yellowstone, the Grand Canyon, and Niagara Falls. The places sitcom stars had visited with their fake families. "Are we going near there?"

Sarah squinted at the poster. "I don't know. I wish I had my phone." She moved to a rack of maps and unfolded one. After careful ...