It is the fifth of November. Soldiers and their families gather to celebrate with a fireworks display and a giant bonfire, but delight turns to fear when it explodes to send flaming debris over the spectators. A battalion of Drumdorran Fusiliers has marched in that same afternoon, and when the wife of their Pipe Major dies from her injuries, the Scots vent their anger on resident troops.
While military detectives Max Rydal and Tom Black strive to discover who put explosive material in the bonfire, news of the true cause of the woman’s death intensifies the internal hostility. When another dangerous incident occurs, they have to find out if these acts of violence are being committed by the Scottish incomers, or by someone who badly wants them gone.