Hoping to find out more about his missing time, Castle headed to Los Angeles with Alexis and Hayley in Castle season 8 episode 14, “The G.D.S.” While there, he was recruited to compete for a spot in the legendary Greatest Detective Society (pitting him against Firefly‘s Summer Glau).
Here’s what Castle uncovered about his missing time in “The G.D.S.”
Castle Recap: We Finally Learn What Castle Forgot>>>
Castle Left a Watch with the Owner of a Korean Restaurant

Thanks to Alexis’ Counter-Surveillance Precautions, They Discover the Watch Is Bugged
There’s a GPS transmitter hard-wired to the battery.
Alexis’ Refusal to Let a Possible Lead Go Ends with Hayley Admitting Her Involvement
The GPS tracker led to Malcolm McCabe, special forces, and when Alexis went to talk to his aunt, she saw a photo of him and Hayley.
Hayley Met Castle a Year and a Half Earlier Than He Thought

Castle Went Rogue After His Mission in Thailand
Instead of going home, he came to L.A. Hayley borrowed the GPS tracker to keep track of him, but when he gave the watch away, she lost him.
By the Time Hayley Found Castle Again, He’d Been Shot
He wouldn’t say who shot him but did mention his CIA handler by name, Jenkins, and said he was going to ask him to erase everything that happened to him.
Castle Tasked Hayley with Showing Him a Video He Recorded for Himself If He Went Looking for the Truth

Castle season 8 airs Mondays at 10pm on ABC.
(Images courtesy of ABC)

Contributing Writer, BuddyTV
If it’s on TV — especially if it’s a procedural or superhero show — chances are Meredith watches it. She has a love for all things fiction, starting from a young age with ER and The X-Files on the small screen and the Nancy Drew books. Arrow kicked off the Arrowverse and her true passion for all things heroes. She’s enjoyed getting into the minds of serial killers since Criminal Minds, so it should be no surprise that her latest obsession is Prodigal Son.