Members of an elite nuclear test detection team have died violent deaths one by one. When the fifth team member is killed right before Scotty's and Kelly's eyes, they are assigned to protect the sole surviving member and find the killer. The prime suspect is the seventh man who washed out of the team and happens to be a friend of Scotty. Scotty tries to reach him though his sister, a singer performing in Las Vegas. But gaining her cooperation will require more than persuasion. I will require a carefully conceived trap.