At a certain point, The Light Between Oceans seems almost single - minded in its pursuit of theme; by the time
the nationality of the dead man in the boat is revealed, the film has made clear that we're watching variations on survivor's guilt — the idea that, in war and maybe life in general, staying alive (or emotionally fulfilled) is often a zero - sum game, dependent on choosing your own well - being over that of a stranger.
The most powerful moment
of the prisoner swap — on a snowy Berlin checkpoint in the
dead of winter — is neither the anxious wait nor the tension
of distrust between the sides but the trust and friendship between the two
men, enemies by
nationality but friends by chance, in their last meeting.