In the early 21st century two books were written about the Sydow murders, Uppsala attorney Anders Frigell's von Sydowmordens gåta ("The riddle of the von Sydow murders"; Uppsala: Uppsala Publ. House, 2002) and the novel I skuggan av ett brott ("In the shadow of a crime", Stockholm: Bromberg, 2004) by the writer Helena Henschen, who is herself a granddaughter of Hjalmar and niece of Fredrik von Sydow.
Helena Henschen (1940-2011) was a Swedish designer and writer.
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