I expect someone lives there in secret, only coming in and out at night, with a dark lantern. We shall probably discover a gang of desperate criminals and get a reward. It's all rot to say a house would be empty all those years unless there was some mystery.
verb /rɒt//rɑːt/ [I or T] (-tt-)
to (cause to) decay
The fruit had been left to rot on the trees.
Rain has got in and rotted (away) the woodwork.
the smell of rotting fruit
Doesn't make sense.