You are in the kitchen with the fire that has been burning since 1665, and every light in the house is still on behind you. On your phone, a new message: put them out the way they came. Mine last.
Hour Four: the lights

The lights she means are on a card the rental company printed for the guests and propped against the history board. Somebody left the dates off, as if everybody knew them:
WHAT BURNS AT SALLOWMERE the wireless set the house lights the kitchen fire the red lamp
Her message, the last but one:
Put them out the way they came, backwards.
You can feel the whole house listening.
Put out the four lights in the order she asked.
Put out so far: nothing yet
Each light belongs to one of your four nights in the house.