Iconic, tough-but-tender Boston PI Spenser delves into the black market art scene to investigate a decades-long unsolved crime of dangerous proportions. The heist was legendary, still talked about twenty years after the priceless paintings disappeared from one of Boston's premier art museums. Most thought the art was lost forever, buried deep, sold off overseas, or, worse, destroyed as incriminating evidence. But when paint chips from the most valuable piece stolen, 'Gentlemen in Black' by a Spanish master, arrives at the desk of a Boston journalist, the museum finds hope and enlists Spenser's help. Soon the cold art case thrusts Spenser into the shady world of black market art dealers, aged Mafia bosses, and old vendettas.