Red line : a Matt Sinclair novel
(Book)

When a teenager from a wealthy suburb outside of Oakland, California is dumped at an inner city bus stop, homicide detective Matt Sinclair catches the case. It's his first since being bumped to desk duty for a bust that went south fast. With few leads and plenty of attention, it's the worst kind of case to help him get back up to speed. It only gets worse as the bodies start to pile up--first at the same bus bench, then around the city.