Paris Requiem (Detective Eddie Giral 2)

Paris, September 1940. After three months under Nazi Occupation, not much can shock Detective Eddie Giral. That is, until he finds a murder victim who was supposed to be in prison. Eddie knows, because he put him there. The dead man is not the first or the last criminal being let loose onto the streets. But who is pulling the strings, and why?
This question will take Eddie from jazz clubs to opera halls, from old flames to new friends, from the lights of Paris to the darkest countryside - pursued by a most troubling truth: sometimes to do the right thing, you have to join the wrong side...