The Nero Protocol

Ario six-four-nine-one is an obsolete synth gigolo—especially when his latest trick proves to be his last in a brutal and horrifying way. But he's only a synth, it's not like he can really think and feel. No one will notice one more out of date synth tossed in the garbage.
Except for Elias, homeless and lonely because he's not what his father—or the world—wants him to be, haunted by a tragedy for which he cannot forgive himself. When he finds a battered, broken, long-discontinued synth in a dumpster, he decides to repair the poor thing despite all the reasons he shouldn't.