its behind the weapon shop. past the bench thats in front of the fountain. to the back of the wood on the left hand side.

also don't forget to search all 4 piles of gold. those are the items you get from the quest along with sam.
space contract, 2x exp potion and 20 bullion (good for TW usually make a bunch of alts just to collect them lol)

and its best to have a 60+ team if you have a good plan. 70+ is better.