Celine Dion is not everyone’s cup of tea, certainly not mine. Her vocal pyrotechnics have always left me cold. But it’s impossible not to be touched by her current plight in this unflinching documentary by director Irene Taylor, who captures the Quebecois singer’s struggles with a rare and debilitating neurological condition SPS (Stiff Person Syndrome).

Filmed in 2022, we meet Dion in her Las Vegas compound where she lives with her children and staff (her husband, René Angélil, died in 2016). Her lifestyle seems entirely befitting that of a multi-platinum recording star who has, over the decades, sold more than 250 million albums. She has motorised closets filled with a vast collection of shoes. In one scene, she visits a warehouse stacked to the ceiling with her memorabilia – stage costumes, designer dresses, even more shoes, her children’s discarded toys.

But it also becomes clear that she is something of a prisoner. Unable to go out independently for fear of falling into spasms that immobilise her entire body, Dion, in her late-fifties now and happy to front up without full make-up, is cut off from the world she one bestrode like a sequined,...