Lucy, Aaron and Alison are preparing to return home with Craig and Holden when Hal arrives and tries to arrest Aaron. Aaron escapes and heads for St. Louis. Hal overhears Lucy tell Craig and Holden about Aarons next destination and sets out after him. Barbara attempts to keep Margo from questioning Will but Margo persists. Later, Will confesses to Margo and Tom that he believes that he started the barn fire. Carly frets over Henrys blackmail and wonders whether she should continue with her pregnancy. Later, Emma convinces Carly to make peace with Rosanna. Something Emma says also strikes a cord with Carly, who decides to keep the baby. Meanwhile, Jack runs into Rosanna and realizes something is wrong as he watches her bond with Parker. Katie finds an old diary belonging to a woman whose marriage reminds Katie of her own. She is disheartened to read that the womans husband left her to go to the Gold Rush. When Simon learns he has inherited a sheep ranch in Australia, Katie worries that he will leave her, too.