Robyn Monroe is the Valkyrie, one of Chrystal Valley's most notorious street fighters, and she never taps out. But she dreams of freedom for herself and her sister--a peaceful life where she can pursue her lost dreams of becoming a ballerina. Working off her late mother's debt to a corrupt bookie is taking a terrible toll, and things are changing in the city's underworld. The stakes keep rising, while her freedom proves more elusive every day.

When first-year resident Dr. Andrew Alexander finds a half-dead Robyn in his ER, the...