Caleb, a young programmer working for the world’s largest internet company, wins the opportunity to spend a week at the secluded estate of its brilliant and reclusive CEO, Nathan. Once there, he discovers that he has been selected to take part in a Turing Test and evaluate Ava, a highly advanced humanoid artificial intelligence. As their interactions deepen, the experiment develops into a tense psychological battle in which nothing—and no one—is quite what it seems.