Adapted by Harold Pinter from the novel by Russell Hoban, Turtle Diary stars Glenda Jackson as a famed author/illustrator of children's books. In the midst of her success, Jackson suffers from writer's block. While casting about for new ideas, she makes several visits to the turtle tank at the local aquarium, where she becomes acquainted with shy bookstore clerk Ben Kingsley. From this point on, nothing is in the least predictable. What can one say that's sensible about a plotline that climaxes with a turtle hijacking? Screenwriter Pinter has a cameo role as "Man in Bookshop." Turtle Diary was the maiden effort of United British Artists, a consortium consisting of Glenda Jackson, Harold Pinter, and producer Richard Johnson (who also appears in the film).
~ Hal Erickson, All Movie Guide