Pursuit - Pursuit of the Knife Boys

Mr. Lawrence Westbourne and his wife Gertrude had been attacked during the previous week by four youths armed with knives. They were badly hurt, but still alive. The couple were returning home from shopping, and were attacked in an alley. Inspector Black brought Mr. Westbourne to a police line-up at Scotland Yard. He chose three individuals, However, he was mistaken on two of them, as they were not involved. The Inspector says "We know this gang has been working the streets for five or six months. This is the first chance we have had to make a positive identification. You and Mrs. Westbourne are not the first victims by a long shot. We need you and your wife both to make identifications". Mr. Westbourne says "I picked out one of them, send him to prison". Inspector says "I'm sure we will, sir, but we need all of them. We need the other three as well".