Leo Barraclough International Features EditorThe action in upcoming mystery thriller “The Reunion,” starring “Harrow’s” Ioan Gruffudd, centers on three characters in two time-zones, 25 years apart, but the emotions and personalities of the characters are consistent, the show’s British director Bill Eagles explained at the Monte-Carlo Television Festival Sunday.The English-language show, produced by Sydney Gallonde at Make It Happen Studio and co-produced by MGM Intl. TV Productions and broadcaster France Televisions, is based on Guillaume Musso’s bestselling novel “La Jeune fille et la nuit.”The story opens in the present day, at a reunion at an international school in the south of France where three former friends reconnect.