ND Richman is publishing a series of Teenage (YA) novels called the Boulton Quest Series. The novels are written in particular for boys and girls from ten to thirteen years of age though have been read and and enjoyed by adults to acclaim. They are fast reads and hard to put down once started. The stories are built around four characters - Christopher at fourteen years, Katherine at fourteen years, Michael at eleven years, and Thomas at eleven years. Christopher and Michael are brothers - one a bully and the other bullied, and their greatest feat is overcoming each other. Katherine and Thomas are brother and sister, and their greatest feat is overcoming Christopher and Michael.
The first novel in the series is called Brothers, Bullies and Bad Guys.