Susan's on the board of the Port City Theater Company, and asks Spenser to help one of it's employees with a stalking problem. Spenser does, but finds no stalker. Then, during a show, one of the actors is shot. While questioning people, Spenser talks to a board member, which upsets her husband, who controls the Chinese gang in the area. So Spenser has no clues and the Chinese "Death Dragons" after him.
To complicate matters (if you believe they aren't already), another woman claims to be stalked, and then is kidnapped. The local police chief is no help, as he's in the "employ" of the Chinese.
Things wrap up in the end, but not after some unexpected plot twists and character development that is really stellar. Usually Spenser is just about fantastic writing and environments. This time Parker also put some solid work into developing the characters you meet, and the cultures involved.
On the downside, I think Parker was on an "annoying women" kick. This woman was TRULY annoying, although to make up for her, the Chinese translator they use is smart, resourceful, and brave.
Port City is very well described - you get a very good sense both of how it feels to wander its streets, and also of its history and people.
An interesting sideline, which provides nice counterpoint to the story, has the pair working on a house in Concord - pruning and ripping out the innards. In addition to Susan and Hawk, Spenser calls on the help of Vinnie - a mob friend (ex-main-man of Joe Broz) with amazingly fast gun draw. He has Farrel, the gay police officer help him out, too.
All in all, one of the greats in the Spenser lineup.