Essex, 1916 Lily is a housemaid up at St Clere's Hall.
But times are changing with the outbreak of war.
With a husband bent on signing up for the trenches and a lecherous master of the house, Lily is forced to leave.
Doing her bit for the war effort - and bringing in more money for the family - Lily goes to work in a factory making explosives to send to the trenches.
It's a hard job.
The munitionettes must face terrible working conditions, the constant danger of accidents and air strikes and a patronising, self-serving boss.
And then someone she never wanted to see there arrives.
Lady Charlotte, the pampered daughter of the Hall, joins the factory as a supervisor.
Lily and Charlotte have choices they never had before - but in the shadow of the Great War, can the factory girls work together for a better future?.