The Midnight Sister — Marvin Albert

Pete Sawyer is a private eye of a different kind. The son of a World War II American pilot and a brave French resistance fighter, he grew up on both sides of the Atlantic -- though he prefers his sun-dappled villa on the Riviera to most other places. He takes pleasure in a fine wine...and a good gun. His French name is Pierre-Ange, and it suits him. In English, it means Stone Angel.
When gutsy Arlette Alfani, a brilliant and beautiful Monaco lawyer, asks Pete for help, it's no cry in the dark. A former client of hers, the notorious killer and jewel thief, Andre Colin, has escaped from jail and the police think she arranged it. Pete puts himself on the case, scouring the discos and streetlife of Paris and the hills of Monaco, chasing every clue to a million-dollar scam in stolen gems and a missing mob boss. What he discovers in an insidious connection to a secret society called the Midnight Sister and a lone brutalized woman he must protect from Colin's revenge. If only Pete can keep her healthy enough, long enough, and keep himself that way, too...