A woman went into a shop one evening to buy a new blouse. A strange man followed her into the shop and stood about while she was at the counter. Suddenly she screamed and the man turned and ran out of the shop, right into the arms of a passing policeman. Then he was caught by the policeman because he was a wanted robber. "Mrs Jones, if you hadn't screamed, I would certainly have been robbed," said the shopkeeper, "I didn't know it," answered Mrs Jones. "I screamed when you told me how expensive the blouse was." The woman was   _  .
a policewoman Mrs Jones a robber the shopkeeper