A series of crime stories in two weekly parts by Michael Gilbert.
[Starring] Brian Wilde, Kenneth Mackintosh
with Steve Plytas, Hana Pravda

The first in a new series of investigations by Superintendent Halcro, head of Room Thirteen - the control centre of Scotland Yard's undercover men. Somewhere in the London area lives a man who can organise large-scale 'accidental' fires at the drop of a hat. It seems an impossible task to find him - which is why the job is given to the men from Room Thirteen.