Here is a description of the book's plot:
Art Hardin, retired military intelligence officer turned private investigator, is content with his regular caseload involving insurance fraud and employee theft. So, when a wealthy industrialist approaches Art to find an old flame, he's wary of taking on the case. Only when pressed by his wife, Wendy, does Art agree to help, but only if the decision to make contact is left to the old flame.
The old flame, a reclusive but prominent artist who has changed her name, turns up dead shortly after Art locates her. His client charged with murder and his detective's license revoked, an angry Hardin then finds himself the subject of "professional" surveillance, his office ransacked, and his life up for grabs as a shoot-out erupts on the street.
The FBI, long on requests and short on information, approaches Art for his help—act as bait. Seemingly out of options, Art agrees, but with an ace up his sleeve. Aided by an outlaw motorcycle gang, Art decides that this time, the bait is going to bite back.