FBI cop is recruited to an unconventional unit fighting the drug trade.

Tense and compelling tale of law breakers on both sides of the drugs war that has a documentary feel.

For an empowered modern cop, though, Emily Blunt's character is annoyingly hand-wringing. Brolin and Del Toro are extremely good, even better Roger Deakins's cinematography and Jóhann Jóhannsson's superbly atmospheric and creepy score.