When an old steamer chest from an anonymous source arrives at Cullen and Luna Bodman's restoration shop and café, it is fascinating in its own right. But inside, Cullen discovers a locked diary accompanied by a letter, asking for the diary to be restored to its rightful owner. Luna sees this as a puzzle to be solved, but everyone isn't thrilled by her quest. Her budding relationship with U.S. Marshal Christopher Gaines comes under strain as he tries to talk her out of a wild goose chase. When the Bodmans unveil a surprising modern-day connection, it leading the brother and sister to wonder if the diary's secrets still hold power today.