Great beginning and any character that reads P&P will have my interest immediately!!
I agree with Cia - the flow was a bit off - the build-up, the shower, the noise the discovery and phone call were great, then the note, and your main character isn't talking until second week..... IMVHO, instead of leaping forward to school, perhaps he could have returned to what you had already mentioned - the moment he put the shampoo in his hair..... his, in effect, "last peaceful moment.
the angst tho' is good, and the resolution of this over his school year should be interesting..... Congrats!