The couple at the centre of the so-called "Gone Girl" kidnapping case reveals new details.

20/20 brings you the story of Anna Sorokin, who conned the highest social circles into believing she was a German heiress worth millions.

Part 1 of 2: 20/20 investigates the tragic murder of social media influencer Gabby Petito, featuring interviews with Gabby's parents, private investigator Jason Jensen & retired special forces veteran Mykel Hawke.