By the very first second the finale of Castle pulls you along a dramatic scenario that keeps on making terrific turns. The case of Beckett's mother is strong and complicated enough to keep your attention but simple and suffice enough to complete within an hour. The portrayal of the bad guy is done fantastic and as the episode progresses you fear for Beckett's life. A fear that turns out to be just.
The shocking, integral twists make the story far better. The relationship of the two leads plays well on the background and compliments the bigger story instead of distracting from it. All-in all the episode is very well set up, told and executed. An hour of great drama, sensation and intrigue that captivates you and surprises you.
Very well done.