It's that time of year again where we note the 50th Anniversaries of particular episodes. Today, it's the Season 4 opener: Highest Castle, Deepest Grave.

The show begins innocently enough with an anthropological dig. Several skeletons are discovered but two don't belong being only 10 years old. they're later identified as Anton Parker and one Mrs. Mondrago. We later find out the pair were having an affair, something her husband (Herbert Lom) may or may not have known about.

While investigating the case, McGarrett is drawn in by a large painting of Mrs. Mondrago. It also turns out that her daughter Sirone (France Nuyen) is an exact duplicate of her mother. Besides his own obsession with the painting, there are multiple obstacles thrown into McGarrett's path as he slowly uncovers the answers and eventually the truth. The twist at the end in one of the best of the entire series and I won't spoil it for those who haven't seen the episode or haven't seen it in a while.

Mr. Mike's excellent review (and pretty awesome gallery) is here: http://www.fiveohomepage.com/5-0log4.htm#73

This episode went outside the lines for the series and it mostly focuses on McGarrett. This isn't a bad thing and was well executed.

Of note, if the artist Duncan (Jeff Corey) seems familiar, he is. He was the doctor in charge of the cardiac patients in S01E13 "King Of The Hill". We also see Moe Keale for the first time as Akea, Mondrago's servant.

When McGarrett and Chin go after Dr. Herbert Ventnor (Bill Edwards) in his huge Lincoln Continental, there are several shots that later become stock footage in the series. Included are the flaming car rolling down the hill as it explodes and the second police officer who jumps into the patrol car to pursue the Continental.

I personally like this episode and every time I watch it, things jump out at me again. While not one of my top favorites, it's enjoyable every time I watch (which I did about 2 weeks ago). I would say this is arguably the top role France Nuyen played in the series during her multiple appearances.

Happy 50th, "Highest Castle, Deepest Grave"!