First broadcast 9th May 1978.

For help, Omney turns to Annabelle Fraser, his old girlfriend. He is convinced that a conspiracy is afoot--and that Clare is sending him covert messages.

James Bolam ... Mark Omney
Rosalind Ayres ... Anabelle Fraser
Michael Culver ... Dr. Walcott Brown
Christopher Benjamin ... Det. Inspector Tarrant
Sam Sewell ... Det. Constable Barnes
Vass Anderson ... Soames
Harold Goodwin ... Kibble
Arthur Blake ... Mr. Dyer
Isabelle Amyes ... Julie Villiers
Milton Johns ... Tim Kennaway
Sally Anne Newton ... Rosemary
Peter Welch ... Mechanic
Kevin Costello ... Photographer
Frank Duncan ... Announcer (voice)