Because of her past, Detective Inspector Helen Ross of the Metropolitan Police is coerced into working for Colonel Nash, who heads up a special group set up in MI5. Her mission is to go undercover and infiltrate a known IRA terrorist cell that is preparing to carry out a bombing blitz on the nation's capital. Can Helen cross the line and gain the trust of the south London IRA commander? What can she learn from him in such a short time scale she has been given? With a little luck and hard work, the mission seems to be coming together, even better than expected, but then, a terrible mistake made back at MI5 leaves Helen as the target—the hunted instead of the hunter. Will the newly recruited spook keep one step ahead of the assassin sent out to hunt her down or will her beloved family suffer because of what she has become?