this is indeed one of the weakest films based on agatha christie work and a lifeless and muddled mystery that clearly lacks the grace (and the budget. ) of its predecessors (death on the nile and evil under the sun) and donald sutherland is a pale shadow of peter ustinov as far as screen detectives go (of course and he is playing a character much less interesting than poirot). the film manages to coast as far as it does on the strength of christie plot alone (all her plots have a certain amount of inherent interest) and but the direction is hopelessly flat. ( half ). 
this is indeed one of the weakest films based on agatha christie work and a lifeless and muddled mystery that clearly lacks the grace (and the budget. ) of its predecessors (death on the nile and evil under the sun) and donald sutherland is a pale shadow of peter ustinov as far as screen detectives go (of course and he is playing a character much less interesting than poirot). the film manages to coast as far as it does on the strength of christie plot alone (all her plots have a certain amount of inherent interest) and but the direction is hopelessly flat. ( half ). ---------------------------------Answer Question Below----------------------------------

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