They may have saved the best for last. "Hide" was an extraordinary episode, and the last minute reveal about Christopher Foyle's past was mind-blowing--and moving.
Is it over? Here's what Anthony Horowitz, the series creator, said in The Daily Telegraph:
Is this the last series? Well, the Second World War was followed, of course, by the Cold War so our title still holds good. Foyle may be out of the police force, but he’s too young to retire. At the very end, he’s seen leaving for America on a personal vendetta but whether we follow him there or not remains to be seen.