Anthony Mann directed this still-timely drama that stars Ricardo Montalban as Mexican agent Pablo Rodriguez, who teams up with American agent Jack Bearnes(played by George Murphy) to tackle the problem of illegal Mexican Immigrant smuggling into California, which has seen many of them mysteriously murdered. Rancher Owen Parkson(played by Howard Da Silva) is chief suspect as the ringleader. Pablo goes undercover from the inside as an immigrant, while Jack investigates from the outside. The case will prove quite dangerous, more than either man realized... Fine drama with solid acting and direction, and an incisive script that wouldn't need much changing to work today, sadly.