Tin by Padraig Kenny
In an alternative England of the 1930s where the laws of mechanics govern even the most talented engineers, a mismatched group of mechanicals want nothing more than to feel human. Under the guardianship of the devious and unlicensed Gregory Absalom, an engineer who creates mechanical children, they have no choice but to help him in his unlawful practice. But through his unethical work, Absalom winds up creating a loyal and lively group of friends who will go to the ends of the Earth for one another.
When the story's protagonist, Christopher, discovers a devastating secret about himself and the friends are torn apart, it's up to his friends to find him. What they'll discover is the secret about the dark experiment that ended in disaster many years before...
Tin is an adventure story about friendship, courage, and loyalty, and what it means to be human.