Trigonometry
Series · 2020
Series profile
The Protectors
1964Episode runtime
CrimeDrama
Ex-insurance investigator Ian Souter sets up his own security agency — the SIS (Specialists in Security) — alongside ex-cop Robert Shoesmith and secretary Heather Keys - and fight crime.
The cast
Faces behind the story
Andrew Faulds
Ian Souter
Michael Atkinson
Robert Shoesmith
Ann Morrish
Heather Keys
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