[s1e8] The Thin Red Line -

In the eighth episode of The Mentalist (Season 1), the California Bureau of Investigation (CBI) is called to a motel to investigate a double homicide. The case quickly becomes a tense jurisdictional battle as Patrick Jane suspects the "thin red line" of law enforcement might be protecting one of their own. Plot Summary

: The CBI must collaborate with the Davis City Police Department, specifically veteran Detective Dale Blakely and his partner Steve Preciado. Jane immediately identifies a hostile attitude from the local detectives toward the CBI team. [S1E8] The Thin Red Line

: Sam killed Patrice because he believed she was his father's mistress. In a final twist, Jane reveals that Patrice was actually Dale’s biological daughter from a past affair—making her Sam's half-sister and the baby his niece. "The Mentalist" The Thin Red Line (TV Episode 2008) - IMDb In the eighth episode of The Mentalist (Season