Break In

Walker and Trivette go undercover in a prison as a convict and a guard respectively to gather evidence on a convicted felon that had a key witness and two rangers murdered, but are unaware that the assistant warden and some of the guards are working for the felon. On top of all that, Trivette gets exposed, forcing Walker to work alone and bust the warden before his own cover is blown and the felon walks free.

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S04E15 - The Return of LaRue