It soon becomes clear their child has been kidnapped and drama ensues.
It is an English-language remake of his 2017 French film Mon garçon, which starred actors Guillaume Canet and Mélanie Laure.
Claire has also been promoting The Electrical Life Of Louis Wain.
The new flick follows Wain, played by Benedict Cumberbatch, as he highlights the ‘ridiculous, frightened and brave nature of cats’ through his art while he looks after his family and falls in love with Emily (Claire Foy).
The period drama, which sees the 1800s through to the 1930s, also features Andrea Riseborough, Aimee Lou Wood, Richard Ayoade, Taika Waititi, Nick Cave and Olivia Colman.
The film is set for release in UK cinemas next year, while it will be released in the US from 22nd October, and will be available to stream on Amazon Prime Video on 5th November.
New film: Claire has also been promoting The Electrical Life Of Louis Wain alongside Benedict Cumbertach (pictured on Sunday)