Sometimes sequels can be a good thing — a very good thing.
That's the story with "Turks & Caicos" and "Salting the Battlefield," the second and third films in what PBS is calling "The Worricker Trilogy," a terrific trio of made-for-TV movies that started in 2011 with "Page Eight," starring Bill Nighy ("Love Actually") as veteran MI5 agent Johnny Worricker.
When last we saw Worricker at the end of "Page Eight," he was in an airport and on the run from just about everyone and everything in Britain. Think Cary Grant in "North By Northwest."
The 60-something Worricker had lost his career, pension, best...