Quim (Sbaraglia), an ordinary man, drives his car along the winding isolated lanes leading to the mountains. Suddenly, a shot is fired. He checks his car; he is hit. Somewhere, hidden in the mountains, lurks an unknown assassin, hunting. Gradually, as the nightmare unfolds, Quim realises an unpleasant truth; he is the prey. Running for his life, he encounters Bea (Maria Valverde), a mysterious woman he met earlier, on his way to the mountains. He is suspicious of her, but with the killer in pursuit there is no one else to turn to. Locked together in mutual distrust, they join forces to try to escape through the hills, desperate to outrun the hunter who is determined they will not escape with their lives.