It was supposed to be a simple job: steal the paintings, leave the forgeries...

When a helicopter crashes through the skylight of the Asian Art Museum, an audacious heist turns into a tragedy. The only witness to the crash is 11-year-old Grace, who watches in horror as her uncle is killed and a priceless statue stolen by two men and a --- ghost? At least that's how the eerie, smoke-like figure with parchment skin and floating hair appears to Grace. Scared almost to death, she flees into the night and seeks refuge in the back alleys of San Francisco's Chinatown.

Grace is found by Sally Mei, self-appointed guardian of Chinatown. While Sally trains Grace in basic survival skills, her erstwhile partner Cape Weathers, private detective and public nuisance, searches for the mysterious crew behind the robbery before they strike the museum a second time. As the clock winds down, Cape enlists aid from some unlikely allies to lay a trap for a ghost who has no intention of being caught --- nor of leaving any witnesses alive to tell the tale.