In "samuel's memory", what happened to samuel's father?

In Samuel's Memory, his mother, his aunts, and his uncles had informed young Samuel that his father had died.

It was said that his father was sick and tired, and probably had succumbed to exhaustion or an illness.

d.) then bernice winced as marjorie tossed her own hair over her shoulders and began to twist it slowly into two long blond braids until in her cream-colored negligée she looked like a delicate painting of some saxon princess. fascinated, bernice watched the braids grow. heavy and luxurious they were, moving under the supple fingers like restive snakes—and to bernice remained this relic and the curling iron and a to-morrow full of eyes.

from the excerpt from the "the dark game" the reader can infer that folke cronholm was spying for the allied nations.