Secret in St. Something (1st ed.)

What is the secret?
In a grim tenement district of New York City, before the turn of the century, young Robin decides to take his baby brother, Danny, and escape from his brutal stepfather. Surviving on the street is no easy feat, until he discovers a place called St. Something, and joins up with the tough but loyal street boys who make St. Something their home.
Robin knows he cannot hide forever -- but what he does not know is how many untold secrets lie before him, and how the answers lie with the most unlikely person....