The Last Dark Place — Stuart M. Kaminsky

Abe Lieberman is a veteran Chicago detective who prefers to use his head and heart more than his gun. He and his Irish partner, Bill Hanrahan, are known on the streets as the Rabbi and thePriest and their commitment to justice is sorely tested everyday.
The extradition of a mob enforcer goes horribly awry when he is gunned down at the airport...while Lieberman is escorting him. A police officer's wife is raped and Lieberman and Hanrahan have to find the perp before the hearbroken, furious cop settles the matter himself. Lieberman and Hanrahan struggle with one vital question: which is better, to be a Just man or to be the instrument of the Law?
And if that's not enough angst, somewhere in all this Lieberman has to plan a bar mitzvah that will surely bankrupt him....