From publisher blurb:
There are four chariot racing teams that run the arena – the Red, the Blue, the Green, and the Purple. Those who race the arenas are owned by the coliseum, bought and paid for. The only ways out are death, old age, or, once in a great while, being awarded the brass ring – the ring of freedom. Win enough races, and you too might win that brass ring. ... At least, that's what the overseer says the morning of every race. But nothing in the coliseum is ever so simple.