Final witness

A gang of London warehouse thieves kill a policeman during a raid. The murder is seen by three people, none of whom is anxious to come forward as a witness. David Wight, a young journalist on TOPICAL TRUTHS, becomes involved in the case, which is being handled by his godfather, Detective Superintendent Morgan of Scotland Yard. David eventually gets his 'exclusive' story, but not before there have been several attempts on his life and other murder...