Mr. Wilson’s pawn shop was at Saxe-Coburg Square. It had a cellar beneath. When Holmes hit the ground with his stick in front of the shop, he found that the cellar was at the backside of the shop where Spaulding spent most of his time. Holmes saw Spaulding’s trouser legs dirty and guessed he was digging a tunnel. He wanted to find out where the tunnel led to. So Holmes went to look at the road behind Saxe-Coburg Square that was the next street at the back of the shop and found the bank there.
