While cataloging books at the library, Anne stumbles on an old, yellowed map of Pennsylvania tucked inside the pages of a historical book from Aunt Edie's private collection. When Anne studies the map, she sees markings that hint at its use by Lewis and Clark! Could it really be authentic? And if it is, how did Aunt Edie come to possess a map that had been stolen from the now-defunct Blue Hill Historical Society one hundred years ago? Meanwhile, Anne's son Ben, starts disappearing for long periods of time, though he's always close by and comes home when she calls. His furtive, increasingly strange behavior and - stranger still for a nine-year-old boy - frequent showering make Anne wonder what secrets her son is hiding from her.