A series of crime stories in two weekly parts by Michael Gilbert.
[Starring] Brian Wilde, Kenneth Mackintosh
with Steve Plytas, Hana Pravda
Music composed by Ron Grainer and played by the Ron Grainer Sextet

Superintendent Halcro is looking for the man who can organise large-scale 'accidental' fires at the drop of a hat. A single clue and a report from one of his undercover men put him on the track of the fire-raiser-a German-born scientist called Miller, who has a small chemist's shop in North London. Miller suspects that Mr. Johnson, who lodges next door, is taking too much interest in him. When Johnson breaks into his stockroom one night, Miller kills him in a fit of panic.