Geoff Hollins is the father ofDavid Hollins, a youngBritish Army officerserving in Northern Ireland who has been found brutally murdered. The circumstances are mysterious, even before Hollins finds his son's girlfriend Siobhan O'Hagan is the sister of Liam O'Hagan, the Provisional IRA man charged with the murder. The intelligence service tries to stop Hollins from attending the trial, and then all charges against O'Hagan are dropped without explanation. Hollins investigates the murder of his son.