I loved the puzzle of the murder victim not being whom she said she was being a creative twist. The fact the Cynthia Dern was on the FBI's most wanted list was a curve ball that Castle willingly catches and runs with to all angles. Dern was writing her memoirs and looking for public sympathy but Castle sees holes throughout the story. Old adage still rings true in this case, follow the money. Which leads them to a ghost who has risen from the dead wanting to make amends from being racked with guilt. I had it figured out when Pike's son heard Cynthia arguing with a woman. But I loved when Castle confronted Wax about putting the pieces in place for the murder to take place to begin with, which was classy.
Castle's interview protocol still needs work but is good for a giggle. I loved Martha giving away Castle's Poker tells; now that was funny.