At her dull Victorian academy, Winnie dreams of becoming a top inventor like her father. When he mysteriously vanishes, she is determined to find him - but how? Help comes unexpectedly from her headmistress. Turns out, her school is recruiting remarkable young women to guard Her Majesty the Queen. Soon, Winnie is not only protecting royalty - but developing the spy skills she needs to save her beloved Papa. 10+ Draws on real-life historical inventions and events.