by Max Marquis.
Starring Joss Ackland, John Slater with David Daker, Bernard Holley

Counterfeit half-crowns are flooding Newtown. They are pretty convincing at a casual glance. Detective-Constable Kane is one of the first to come across a dud when his sister finds one in her handbag.
Blind Wol, the match-seller, is also given a dud, and it is his 'description' of the person who gave it to him that eventually leads Sgt. Stone to the culprit.