Harried fashion entrepreneur Jules gets a surprise boost from Ben, a 70-year-old widower who answers an ad seeking a senior intern.

When Lou Bloom, desperate for work, muscles into the world of L.A. crime journalism, he blurs the line between observer and participant to become the star of his own story. Aiding him in his effort is Nina, a TV-news veteran.

A twisted yet ingenious killer torments a veteran Secret Service agent who's haunted by his failure years ago to save President John F. Kennedy.