In turn-of-the-century San Francisco real-life heroine Donaldina Cameron earned the name "the Chinatown Angel" for rescuing Chinese slave girls forced into prostitution. To the tongs and brothel owners, though, she was Fahn Quai — the White Devil, with a price on her head.

Now as Donaldina journeys to Seattle's ill-famed Restricted District an unlikely romance blossoms between her and a hard-bitten IWW organizer as they team up to rescue another girl from a brothel guarded by the tongs, the police, and a kung-fu killer.