With an enviable flat in the heart of glamorous New York and a passionate marriage, British newlyweds Liv and Will are enjoying the American dream. However, a terrible secret threatens to ruin the fairytale.

Liv and Will arrive in Yosemite, but the shocking appearance of Cara derails Liv's plan. As the conflict between Liv and Cara grows, more information comes to light and with Liv's marriage hanging in the balance, revenge becomes the only choice.

Liv awakens to the devastating awareness of her actions. The requirement for an alibi is essential, but as the search commences, a terrifying surprise awaits her at her door.

In Vegas, Liv and Will make a toxic pact. Back in New York, Liv tries to escape the horrific repercussions of the trip as Detectives Rawlins and Wiseman start to get closer to the truth.

Liv's mother, Caryl, comes from Wales and has some complicated questions for her daughter, just as cops are about to reach Liv.