Castle Season 5 turns serious on Monday, as Rick and Kate must figure out why Homeland Security is taking over their latest case.
But, as always, the ABC hit finds time for some levity, starting with Castle, Becket and Espo trying to get to the bottom of an investigation. And Castle has the answer! The machines have achieved consciousness!
Watch this sneak peek to see what we mean:
Elsewhere, prepare for what may be the best Caskett scene of all-time. Or at least Top 5.
Enjoy this clip of Beckett totally pranking her gullible man;
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