I love Agatha Christie's books and the previous games, so this is welcome news indeed.
'And Then There Were None' is my favorite AC novel and if you want to see the best film version, imo you need to track down the Russian version 'Desyat' Negrityat' which is the only film adaptation to use Christie's original ending.
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Friendship is unnecessary,like philosophy,like art.It has no survival value;rather it is one of those things that give value to survival-C.S.Lewis