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. I was glad to see that Duffy is finally in a relationship that has a future. This is the 5th book in the series and each book gets better and better. I'm looking forward to reading the 6th book and highly recommend this series to those who love learning about Irish history during the 'Troubles' in the 80's.