The trials and triumphs of one of the wealthiest and unhappiest families of the United States, the Gettys. Originally planned to be told over multiple seasons and spanning the twentieth century, the series begins in 1973 with the kidnapping of John Paul Getty III, an heir to the Getty oil fortune, by the Italian mafia in Rome.

Insomnia tells the story of successful career woman Emma Averill, who fears she is losing her mind after suffering from sleep deprivation two weeks before turning 40. Her mother had a similar experience at the same age, suffering a violent psychotic breakdown on the night of her 40th birthday. But even as she relives the experience of her mother, Averill believes other forces may be at work. Her mother is hospitalized with a sudden injury, her estranged sister returns without warning, and she feels as if she is being watched. Only by investigating the truth of her painful past, can she find the answers to her present.