Written by Emile De Harven.
Follow Up Your French in a twenty-five-episode thriller serial.

A duel in the dark, and the seventh trail is laid.

With Monique Messine as Catherine Leger, Michel Forain as Jean Dacier
and Gisele Grimm, Gerard Buhr

(First shown on BBC-2)
(Repeated next Sunday at 11.30 a.m.)