6 episodesFirst aired 26 October 2018
Based on the “creepypasta” short story Hidden Door by Charlotte Bywater, season four follows newlyweds Jillian and Tom, who have each brought secrets into their marriage. When they discover a strange door in their basement, those secrets start to threaten their relationship — and their lives.
E1Oct 201842m
An unsettling discovery prompts newlyweds Jillian and Tom Hodgson to suspect their home is haunted by past secrets.
E2Oct 201842m
After witnessing a murder, Jillian digs into secrets from her past; Tom realizes he's in danger.
E3Oct 201842m
A terrified Jillian and Tom reveal their secrets and try to overcome the devastating consequences.
E4Oct 201842m
As Jillian's old friend relentlessly hunts Tom, she teams up with a neighbor to try and save him.
E5Oct 201842m
Ian makes a grand gesture that threatens to drive Jillian and Tom apart forever.
E6Oct 201842m
The Hodgsons set out to defeat the demons in their marriage once and for all.