The secret weapon developed by the man Cavanaugh is assigned to protect is like Kryptonite to the former Delta Force officer turned security guard--it multiplies the effects of adrenaline, a hormone associated with fear, so it incapacitates instead of energizing him. A lot of people want Daniel Prescott's secret, but Cavanaugh, who's felt the drug's effects, wants his antidote. When Prescott disappears, Cavanaugh and his wife Jamie go after him in a high-speed chase that traps them between government agents and foreign operatives each racing to find the scientist first and kill him before he can use his formula on them.