James Mather is a psychiatrist in his sixties. He is invited to take on a new group of patients. All he knows about them is that each one claims to have been abducted by aliens. His wife, Deborah, is sceptical, but he gets going anyway. His patients tell mesmerising stories.

There's Anthony, for instance, who was camping one night by the Aral Sea; or Mary, the owner of a beauty salon, confronted by a ball of light moving towards her in her bedroom.

James's research assistant Lucy Cheng sits in on each session. She's an attractive young divorcee, who has made a study of anxiety, and who takes notes about each conversation. Capture is a strange philosophical fable about what we can believe in a post, truth world.