There is nothing. Something happens, perhaps we hear a noise. A question arises, "what was that?". And we find the answer.
Everything works like this - it's cause and effect. Now, the really interesting part is where we try to find meaning in this. The truth of the meaning is in the process itself, not the details.
And what are the details? Us, life, we are the details.
Do you know what I'm suggesting here?