When detective constable Jane Tennison survives a deadly explosion at Covent Garden tube station ,she finds herself in the middle of a media storm. Minutes before the blast, she caught sight of the bomber. too traumatized to identify him, she is nevertheless a key witness and put under 24-hour police protection. In a nail-biting race against time, Jane must convince her senior officers that her instincts are right before London is engulfed in another bloodbath.