Well it would have been helpful if you provided an essay prompt.
With the limited amount of material in your post, I can tell you that your grammar needs to be worked on. You use too many commas, when in fact, full stops will do. Some sentences are awkwardly expressed.
Your overall flow, partly due to the grammar and expression, is quite poor because it just goes on and on and on and has a somewhat, rambling tone to it.
Also, your first two lines...
It was a typical late saturday night in the summer, my father was sitting in front of the computer and surfing on the web, and I was preparing to go to sleep.
^Apart for the obvious grammar errors, you have to say how it was a typical late night 'UNTIL'. You need to signal the contrast with the typicality and the event, because naturally, the event was far from your typical Saturday night.
Subsequently, I heard a sudden closing sound of the front door, thinking that the door was caught in wind, I went to bed peacefully. At two in the morning
^Again, the grammar here is very weak.
There are commas in stead of full stops and
thinking should be in the past tense.
Also, 'Subsequently; in my opinion, has not been used correctly given the context. It was not a subsequent result of anything.