Los Angeles SWAT cop Jack Traven is up against bomb expert Howard Payne, who's after major ransom money. First it's a rigged elevator in a very tall building. Then it's a rigged bus--if it slows, it will blow, bad enough any day, but a nightmare in LA traffic. And that's still not the end.
Susan switches identities with her new friend Nicole, so that Nicole can pay for her medical bills with Susan's insurance. Then Susan finds herself trapped in her new identity when Nicole ends up dead under questionable circumstances.