The play is not so much narrated as performed by Olivier Award winning actress Juliet Stevenson, who guides the listening audience – a significant portion of the production unfolds in utter darkness – through Saramago’s nightmare imaginings of what would happen should humanity be struck by a sudden epidemic of blindness. With (masked) audience members scattered in socially distanced, arranged-just-so pairs of seats across the otherwise empty floor of the Daryl Roth Theatre, Saramago’s thriller, adapted for this Donmar Warehouse production by Tony Award-winning playwright Simon Stephens (The Curious Incident of the Dog in the Night-Time) and directed by Walter Meierjohann, slides up beside you like a whisper and, when necessary, a scream. The epidemic is recounted at first on a….