Back. Nothing to see, nothing to hear, nothing to smell that wasn't there before. I went all the way to the railway station, if it had been even halfway that far off the sound ought to have woken everyone. I checked the basement too but nothing strange there either. I was not asleep at all, so I did not dream it. WT*? It was like one single explosion, not a long shake or rumble, but much louder than the noise of the passing heavy trains, which are enough to make the house shake just a little.