Hollywood has-been Elisabeth Sparkle didn’t look where she was going, and got badly shaken about in a traffic accident. Now she’s in the emergency room, and an unfeasibly handsome young male nurse is running his fingers down her spine. Nothing’s wrong. On the contrary: Elisabeth (played by Demi Moore) is, she’s told, “a perfect candidate”.

The next day she gets a box in the mail. Inside is a kit that will enable her to duplicate herself. The instructions couldn’t be clearer. Even when fully separated, Elisabeth and the younger, better version of herself who is birthed amniotically from her spine (Sue, played by Margaret Qualley) are one. While one of them gets to play in the sun for a week, the other must lie in a semi-coma, feeding off an intravenous drip. Each week, they swap roles.

The Telegraph London