Anyone who has been in a long-term relationship will probably recognise the behaviours at the start of the film. A couple largely going through the motions, living the same routine from day to day with neither really thinking about the quality of their lives. In this case it's Deborah Kerr ("Cathy") and husband "Robert" (Robert Donat) who are in this malaise. Along comes WWII, though, and the pair are separated and their existences given much more varied and dangerous twists which make their post-war reunification quite bumpy. Indeed, it doesn't take them very long to realise that they have…