To Each His Own (New York Review Books Classics) by Leonardo Sciascia, Adrienne Foulke

This letter is your death sentence. To avenge what you have done you will die. But what has Manno the pharmacist done? Nothing that he can think of. The next day he and his hunting companion are both dead.The police investigation is inconclusive. However, a modest high school teacher with a literary bent has noticed a clue that, he believes, will allow him to trace the killer. Patiently, methodically, he begins to untangle a web of erotic intrigue and political calculation. But the results of his amateur sleuthing are unexpected—and tragic. To Each His Own is one of the masterworks of the great Sicilian novelist Leonardo Sciascia—a gripping and unconventional detective story that is also an anatomy of a society founded on secrets, lies, collusion, and violence.