The police make arrest

One sunday evening a police sergeant and a constable knocked at the door of Number 10 Royal Row.
"Mr. Williams ?" said the sergeant."We have reason to believe that there is stolen property in this house. we'd like to see your son , Jim". Gary looked at the policeman suspiciously. "what's he done?"
"the doorstep isn't a good place to talk ? isn't it, sir?" said the sergent. "May we come inside?"
Gary hesistated. the he said , "Have you got a warrant?"