Gentlemen by Michael Northrop
Micheal and his friends are you typical blow off school, lazy slacker, probably going to end up in juvie, group. But when their friend turns up missing, and the English teacher tosses out hints that his body may have been stuffed into the barrel on display for the class, they band together to convince that teacher to admit to what they have done. When Bones takes it way too far, they must decide what is more important, their friendship, or their freedom.
Quick read that really left me wondering what would Micheal's life be like after the fact.