Emmeline Muchamore is a well-bred young lady hiding explosive family secrets. She needs to marry well, and quickly, in order to keep her family respectable. But when her brass heart malfunctions, she makes a desperate choice to steal the parts she needs to repair it and survive. She is unable to explain her actions without revealing she has a steam-powered heart, so she is arrested for theft and transported to Victoria, Australia - right in the midst of the Gold Rush. Now that she's escaped the bounds of high society, iron manacles cannot hold her for long. The only metal that really matters is gold.