Mary Elmes was a brilliant young woman from Cork who ventured into war zones to rescue children in trouble. When she learned that children in war-torn Europe were getting hurt, she wanted to help. She wasn't a doctor or a nurse, but she was a great organiser and soon she was running several hospitals, where she made sure there was always time for toys and play.

Knowing that Jewish people were in grave danger, she even risked everything to smuggle children to safety in the boot of her car. She was arrested and imprisoned but nothing could stop her from returning to the children as soon as she was released. Through the voices of real children she saved, Miss Mary tells the magical story of one woman's love for children, and the lengths Miss Mary went to protect and comfort them.