Detective Sing arrived at the scene of the robbery of a coastal house to find a man, Mr. Jones, complaining that his jewels had been stolen. Detective Sing arranged to have him taken to the local police station to give a statement. After a quick search of the area, they found the thief not far away (he hadn't had time to escape), but he was refusing to give up the location of the jewels, and the name of his accomplice. Because the thief had been found quickly, Detective Sing ordered a search of the nearby area. The jewels were found buried beneath a beech tree.
Detective Sing arrived at the police station to talk to Mr. Jones, who was complaining that he had been left alone in the interview room for hours. Detective Sing quickly explained that they had caught the thief, and discovered the jewels.
Mr. Jones, agape, asked where they had found the jewels.
Detective Sing explained that they were found buried at the beech.
"But how did you know which tree they were buried under?" asked Mr. Jones.
Detective Sing immediately arrested Mr. Jones as the missing accomplice.
Why?