Castle (2009)

S6E17 In the Belly of the Beast

Beckett is brought in to help with a drug investigation, but what starts as a standard operation quickly turns perilous when an undercover assignment takes a dangerous turn. To make it out alive, Beckett finds herself in a tense showdown of intelligence and strategy against some of the most ruthless figures in New York’s criminal scene, including a formidable adversary from her past.