Threshold review – road trip out of hell in iPhone horror

A brother and sister try to escape a satanic spell in this cruddy horror story shot entirely on smartphones

In some corner of a US nowheresville town, sad-sack musician-schoolteacher Leo (Joey Millin) gets a call from his mom begging him to pick up his screw-up of a sister Virginia (Madison West). Virginia has had an on-off problem with drugs that ruined a once promising law career. Leo is sceptical of her latest excuse for being found in a squalid apartment looking high, even though there are no obvious track marks: she claims satanic jiggery-pokery has fused her bodily sensations with that of an unknown man, so she feels all his pain and pleasure and vice versa. She has no idea where he is - but carving where r u?" into her arm prompts a handy reply with precise coordinates. So off Leo and Virginia go, for a family road trip.