Hunzinger's Mechanical Circus, a rollicking seaside carnival where imagination meets machinery, shines as the only bright spot in the dreary city of Purinton. A shadow is cast there one day when a tall, cloaked figure approaches the stand of Will Marchman, a young patent-medicine salesman. Fanule Perfidor, commonly known as the Dog King, isn't welcome at the Circus. No resident of Taintwell is; they're all Branded Mongrels, officially shunned. But Will is beguiled by the stunning, mysterious Perfidor. Their mutual wariness soon gives way to desire, and a bond forms. Soon the naive but plucky pitchman becomes embroiled in a dangerous quest. Fanule suspects Alphonse Hunzinger and Purinton's civic leaders are responsible for the disappearance or incarceration of countless Branded Mongrels. But why? As Will's passion and regard for his tormented lover grow, he's determined to help Fanule get answers and prevent any further persecution... or worse. They just have to stay together—and stay alive long enough—to see their plan through.