A sadistic killer roams the shadow world of undocumented aliens, and the first glimpse law enforcement has of him is when tough, determined female Border Patrol Agent Hunter Kincaid watches through binoculars as the killer shoots his own partner for being too slow, then crosses the Rio Grande into Mexico. Two thousand miles away, South Florida Homicide Detectives John Quick and Randall Ishtee investigate the machete murder of an undocumented female, and a slender thread of evidence stretches all the way to West Texas. John and Randall join forces with Hunter to track down the monster. What they don't know is that the killer is aware, and has turned focus on them, like a Great White speeding toward an unsuspecting swimmer.