(Might contain spoilers for some)
When you visit Agatha's house the second time,
You'll get to the part where you found Agatha's body and the police will arrive to the house within a time limit.
During that time limit, you can find an article in the big birdcage in the middle of the room.
You can open that birdcage by using a key or a knife.
You can find the knife on the kitchen table, where you also have found the matches to lit the candles with.
The key is in one of the cupboards.
If I'm not mistaken it's the cupboard in the séance room, where you took the candles out.
If not, there is another cupboard in the birds room, where you took out the birdseed.
This might not be a usefull tip, but you have atleast a longer gameplay with this sequence.
Otherwise it just looks like you're passing through.
You enter through the front door, you enter the room, and you leave through the window.
Short, Isn't it?
But with this tip, it will be a bit longer, and maybe challenging too, because of the time limit.