Molly Brown's sixteenth birthday party for Rose Walsh McLean in May of 1911 takes place at what is now the Molly Brown House Museum in Denver, Colorado. Rose meets Cad Carnegie in the foyer and he asks her to marry him. Their engagement lasts until April of 1912 when the wedding party is returning from Europe on the maiden voyage of the Titanic. A handsome steerage passenger named Jake Lawnsan persuades Rose to leave her world of high society. Rose decides to stay with Jake while the ship is sinking into the freezing water of the North Atlantic. She assumes the name Rose Lawnsan aboard the rescue ship Carpathia. Rose returns to Denver with Molly Brown and the Blue Heart Diamond necklace Cad had left in a pocket of her overcoat. In April of 1996 while in California with her granddaughter Lindsey, Rose sees a news broadcast about treasure hunter Brice Buhaven who is excavating the wreck of Titanic. Rose somehow knows he is searching for the Blue Heart Diamond necklace she has locked inside her safe. Rose and Lindsey fly to Halifax, Nova Scotia and Rose shares her story about the Titanic disaster on the research ship Keldysh.