Set during Northern Ireland's 'Troubles' in 1987 with car bombs and riots. It is a work of fiction but is based on real historical events. A locked-room mystery kept me guessing throughout. Loved the humor of Sean Duffy and his sidekicks, Crabby and Lawson. This is the 5th book and each book gets better and better. I'm looking forward to reading the 6th book and recommend to those who love Irish history during the 'Troubles' in the 80's.