As World War Two grips Europe, Kitty boards a ship for England; leaving her cruel father to work in a munitions factory. She hadn't wanted to leave Ireland, but she really needed the money with tiny baby Billy back in Dublin without a father. In Lancashire Kitty settles into the hard work and makes new friends. Working by day and playing in the Bomb Girls Swing Band by night, life seems to be looking up. But Kitty has a secret. And when a letter arrives from home, she realises she might need her friends¿ help before it's too late and she loses her baby forever .