Different laws may apply world wide. Ie: in Europe is not about the publication date, but author life-span (author’s works get in public domain 70 years it’s death: TinTin gets in PD in EU in the 2054)
Different laws may apply world wide. Ie: in Europe is not about the publication date, but author life-span (author’s works get in public domain 70 years it’s death: TinTin gets in PD in EU in the 2054)
Maybe more of a mystery story? Just take the “investigative reporter” angle and run with it.