Stranger in Paradise by Robert B. Parker

The last time Jesse Stone, chief of police of Paradise, Massachusetts, saw Wilson "Crow" Cromartie, the Apache Indian hit man was racing away in a speedboat after executing one of the most lucrative and deadly heists in the town's history. Crow was part of a team of ex-cons who plotted to capture Stiles Island, the wealthy enclave off the Paradise coast, by blowing up the connecting bridge. Residents were kidnapped, some were killed, and Crow managed to escape with a boatload of cash, never to be seen again. Until now.