An anonymous letter is read out saying that every last Protestant man, 
woman and child is to be murdered. Panic takes hold. Two teenage boys, Daniel and Robert Sherrard, help close the city gates against the approaching Catholic army.
 
The siege has begun.
 
Bombs rain down. Behind the walls, tensions grow day by day. Trapped, the people are injured, dying, starving. But there is no going back …
 
Daniel and Robert are drawn into a fight to the end.