Hope I'm not breaking any rules.
The outline goes, friends driving to mountain get-away, all have experience where they see something at the top of a mountain. One of the friends asks them not to relate what they saw but rather all draw images and compare. Continue on to spooky holiday house terror/the void ensues.
Can't get the episode out of my head, it been a least a year since I listened to it.
More details that I sort of remember,
They all see different entities atop the mountian that share a characteristic somehow, time distorts when they get to the house and they are essentially haunted by the entity that they saw, indirectly.
If anyone knows...
Thanks,