Tessa and Marian are sisters living in Northern Ireland. Tessa is divorced with a young son and works for the BBC. Marion is single and is a paramedic. One day Tessa learns that her sister has been involved with the IRA(Irish Republican Army) and may have been involved in a number of violent crimes. After learning the truth about Marian, Tessa’s life is never the same.

Trust Her is a sequel to Northern Spy. Northern Spy is an interesting, sometimes tense, read, but Trust Her starts off exciting and anxiety-provoking and never lets up. Although it is the least dramatic of the two, it is necessary to read Northern Spy first.