Animus Paradox by Adam Bassett:
 
There's a thief on the loose. The Tigres excel at tipping the scales in their favor, be it through bribes, politics, or blood. They unofficially run Viterbo, Italy—and somebody stole from them.Private investigators David and Mafalda De Campo have been hired to help find the thief. They're in it for the money, but the Tigres just want to make a statement.Meanwhile, the Heredes have returned: ruthless idealists and revolutionaries. It’s not clear what they’re up to, but they keep getting in the way.The De Campos will need to decide how far they're willing to go for this job and the Tigres. Viterbo may soon become a battlefield, and one wrong move could set it aflame.