The quiet community of Chevy Chase, Maryland is shaken when wife and mother Leslie Preer is found murdered in her shower. Detectives find plausible suspects quickly, but without evidence the case goes cold until a surprising lead unmasks the killer two decades later.

INTERVIEWS WITH: Leslie's siblings and daughter Lauren Preer, Montgomery County Police Officer Jim Barnett, Detectives Ed Golian, Tara Augustin and Alyson Dupouy, Leslie's boss Brett Reedy and others

When the wife of a Florida kidney doctor reports a burglary from their waterfront mansion, authorities arrive to find the doctor dead at the bottom of the stairs; investigators discover a connection to the murder of another doctor decades earlier.