Who wrote "In Search of the Castaways" ("The Children of Captain Grant")?

Bad question. Should have original or all alternative titles.

Dorania, Agreed, would have been good to have had an understanding of the plot also.

Dorania, Made into a film. The Castaways, I believe, in the early sixties. Starred Hayley Mills and Maurice Chevalier. I was at the premier held at the Plaza Piccadilly.