Unexpectedly the phone rings and she gets what she at first thinks are prank calls from a distressed young woman Oh Young-sook (Jeon Jong-seo) who says she thinks her mother is going to kill her.
Looking into this online she finds out that this actually happened 20 years ago and using information about the Police case resolves to save her from this terrible fate.
Pitched by Netflix blurb as horror this is more a weird time paradox butterfly effect game of cat and mouse where feeding information back down the phone changes the two people's lives.
It's Donnie Darko meets Single White Female at The Lake House.
I quite enjoyed it but it's a shade too long and I was getting distracted towards the end. Solid but unremarkable 6/10.