Last week a fire broke out at our apartment complex on the 7th floor. When i was going from my 8th floor apartment down the fire escape, there was a little girl struggling to get out onto it from her own apartment. I think this room was where the fire was, when i got her out, lots of smoke came out with her. Thankfully, she was okay and no one was hurt.
If you just want to know which sentence in <em>any</em> story, then I would just say the thesis. If there is supposed to be a story attached then I have no clue! :D