Castle 8x15 End Scene Beckett & Castle Kiss and Will Fight LokSat together “Fidelis Ad Mortem” Season 8 Episode 15.\rbr\rbr\rbr\rbrCastle 8x15 Sneak Peek for coming Monday night Season 8 episode 15 “Fidelis Ad Mortem a scene with Captain Beckett teaching a new recruit some fight .\rbr\rbrCastle 8x15 Sneak Peek #2 for coming Monday night Season 8 episode 15 “Fidelis Ad Mortem a scene with Castle & Beckett where Martha shows up with her .\rbr\rbrCastle season 8 Episode 15 promo for the coming 8x15 ” Fidelis Ad Mortem ” - Kate Beckett returns to the NYPD academy training ground to investigate murder .