A group of young adults still living in the family home after their parents have died, find that the house AI begins to take liberties and oversteps its duties. Initially just the odd change, things start to get problematic when rooms, then whole floors start to appear and disappear, and new rooms appear in their place.
When new rooms start to appear with their displaced inhabitants, the group of siblings is finally broken asunder, as some disappear in rooms, and others take a decision to leave.
A parable on having to leave the past behind, and the re-uniting (albeit brief) with the long dead family pooch will have your eyes pooling with tears, or barfing. (We’ve had a dog for a year now, so I’m now in the former camp…)