As you look over the letter you suddenly get an idea.
You pull out the envelope the letter came with, and... There it is! A return address! You now know where the letter was mailed from. So, you can track it down.
Ten minutes, and an internet web search later, you have a map to the address the letter came from.
You quickly change yourself back into an adult, get dressed, and proceed to walk to the location the map indicated.
8:42 PM
About one hour after leaving your apartment, you arrive at the location on your map.
There appears to be a mansion, out in the middle of the woods, with the only other sign of civilization for miles is the road you used to get here.
"Greeeeeeat. Whoever has the Book of Mind is an eccentric millionair who lives out in the middle of nowhere.... The worst part of this, is that I saw it coming."
You can't stall forever, you either go in or leave.