Even the Darkest Night, Серый

Two dead at the Adell house . . .
But nothing in the duty officer's report can prepare Melchor Marin for what he finds. A wealthy couple tortured to death in an almost ritualistic manner. The little town of Gandesa in the backwater region of Terra
Alta, Catalonia, is suddenly at the eye of a media storm.
Melchor is no stranger to notoriety. He was sent to Terra Alta to lie low after foiling a terrorist attack. And, before
that, he was jailed for his role as driver for a Colombian drug cartel, his decision to join the police inspired by a
desire to avenge his mother's murder and a copy of Les Miserables from the prison library.
Gradually, the leads in the Adell case dry up, and Melchor is ordered to back off. He doesn't, willing to sacrifice his reputation and career in a ruthless pursuit of the truth. But dusk is already falling on the darkest night of his life.