Young and wide-eyed, Kathie falls in love with charming yet quirky real estate scion Robert Durst, only to find their marriage turning stranger, darker and more disturbing as time passes.

This is the true story of crime author Joe McGinniss's journey to write "Fatal Vision", a best-selling book about Jeffrey MacDonald, a Green Beret doctor who's accused of slaying his pregnant wife and two daughters in the early 1970s