Diego Davino has been a hitman for fifteen years and has never had second thoughts about his chosen profession. Over the last year, however, he has been getting an unsettling feeling whenever he has to do his job, and he knows better than to blame it on the one thing he hasn't had since he was a teenager - a conscience - but no matter how much he tries to push the thought out of his mind, it keeps coming back.

As Diego struggles to understand the reason for this feeling, his job becomes more and more difficult for him to carry out.

Has his conscience really returned? And if so, why?

His crew – a strict boss, a young and bloodthirsty apprentice, and a pair of brothers – and constant work having to be done, does not make it easy for him to figure out the reason for, and the solution to, his predicament.