I wrote again

[reynardo]

In the world of Swallows and Amazons, it's WWII and John Walker (Lieutenant, Royal Navy) is seconded to Australia to serve on the Perth. Nancy Blackett is waiting at home for him, involved in her own secret work for the War.

Then the Perth is sunk and he's captured by the Japanese.

In the current day, their grandson has the collection of the letters and articles between the family.

The Value of a Life, for elen_nare.