ThefilmfollowsSpecialforcesveteranLeeGunnerashetakeshistwoboysonacampingtrip,wheretheboysstumbleuponafentanyllabandarekidnappedbydrugrunners.Unfortunatelyforthedrugrunners,Leewillstopatnothingtogethisboysbacksafely,goingupagainstnotonlythecriminalcartel,buttheFBIandlocalpoliceaswell,usingthefullforceofhisdeadlyabilitiestoreunitehisfamily.

在兩個孩子誤打誤撞進入制毒窩點被綁架后，特警老兵“槍手”(Gunner)需要深入毒梟幫派內部，在與犯罪分子和當地警方周旋下救下他的海紫。