Plot

Harry mourns the suicide of a retired MI-5 officer until a journalist informs Harry the officer was murdered because he'd been about to sell his autobiography and expose a lifetime of service secrets.

When a retired senior member of the Security Service, Clive McTaggart, is found dead in his home, it's put down to suicide. The man had been suffering from cancer so suicide is not an unreasonable conclusion. It's not that simple however. McTaggart had written a book and had arranged for journalist Gary Hicks to visit him that day and Hicks actually saw him being killed. He's soon in touch with Ruth Evershed and MI-5 begins an immediate investigation. Without knowing who might be out to stop the publication of McTaggart's book - and realizing it could even be another part of their own organization or another intelligence agency - they play their cards very carefully. The team get unexpected help from an aspiring journalist, Jo Portman. They also happen to be looking for new recruits.—garykmcd

A high ranking member of the intelligence services with a plan for a tell-all book commits suicide with some coaxing from a few very persuasive men. When an acquaintance of Ruth (Nicola Walker), a shady tabloid journalist, stumbles upon the suicide in progress, MI-5 are charged with protecting him from whoever killed the intelligence officer, as well as himself. In the course of the investigation, Adam (Rupert Penry-Jones) crosses paths with someone who may prove a valuable to asset to the MI-5 team.