Hercule Poirot looks into the case of a woman accused for two murders: there is overwhelming evidence against her, her dislike for one of the victims - the girl who stole her fiancé's heart - is well-known, and she doesn't express any feelings of regret. Despite all that, a doctor, who is secretly in love with her, is convinced of her innocence and asks his old friend Poirot to help him prove it.
Let me put it simply: the story, direction, performances, music, and set design of "Sad Cypress" are of higher quality than approximately 90% of what is available out there. Dropping the (highly entertaining, it must be said) sidekicks, changing the tone to almost completely serious, and reducing Poirot's screen time in favor of the other characters (in fact, it could be argued that the beautiful Elisabeth Dermot Walsh is the central figure here) are all bold moves, and they pay off brilliantly, in this case at least. Up to this point in the series, and without having seen "Five Little Pigs" yet, the only episodes I would rank above this one are "Wasps' Nest" and "Lord Edgeware Dies".
A must-see if you love good cinema, even when it's made for TV. (***1/2)