UNSANE

Cert 15

Digital today, disc Monday Claire Foy swaps the world of royal life on TV’s The Crown for a stretch as an inmate in a psychiatric asylum in this diverting thriller.

She’s tremendous as a stalking victim who unwittingly commits herself to observation in a secure facility, and then finds it impossible to convince anyone she’s sane.

An early adapter of digital technology, director Steven Soderbergh shot the film on an iPhone with impressive results to create a scarily septic environment as he mixes in elements of medical corporate conspiracy with juicy slasher moments and claustrophobic paranoia.