‘O Horizon’ Review: Maria Bakalova and David Strathairn Are Reunited by App in a Slender AI Allegory

A decade or so ago, the premise of “O Horizon” might have seemed like “Black Mirror” fodder: Fed various photos, videos, messages and personal effects of a dead man, a computer program devises an interactive simulacrum, available at any time for conversation via a phone app, live if not alive.

Today, the idea doesn’t feel […] ...