The Leaf Who Didn't Fall Far From The M.C., Book 19 in Cocker Brothers, Tonk Jr.:
The Ciphers are heroes, albeit by unconventional means. But Tonk Jr. was odd-man-out back among them. Didn't like to fight. Kept to himself. Preferred to read. Until his calling came for him.
Now in NYC, while studying to help people for a living, Tonk Jr. meets a new mother with a bruise she doesn't want anyone to see. She needs a hero, but could this handsome, bookish guy be the one to set her free?