The resolution of the mystery differs from the original television series on which the film is based. In the film, it is revealed that the one-armed man was a hired assassin and that Richard himself was the target, not Helen. This was part of an elaborate conspiracy surrounding a deal with a pharmaceutical company. The final episode of the television series has a much simpler conclusion: there was never a plot behind the murder. The one-armed man was a common burglar. Although, he is revealed to have a secret ally who helped him evade the authorities for all those years that Richard tried to prove his innocence.

Film

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