If you call yourself a fan of Carol Reed, then I have no doubt you will enjoy this film.
This film is right on par with The Third Man and The Fallen Idol, as it is complete with quirky dialogue, quirky plot twists, uncomfortable situations (which Reed does excellently), and perfect camera-work.
If that is not enough, Alec Guiness delivers a wonderful performance, and just in case you want more star power, Burl Ives, Noel Coward, and Ralph Richardson all have some excellent scenes and wonderful performances. A personal favorite of mine is Richardson's reaction and resolution to the problem - done so carelessly yet so casually. Wonderful.
This film will no doubt become a yearly watch for me. I sincerely enjoyed this film.