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

Bad question. Should have original or all alternative titles.

I just guessed.

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.