Tough Lessons

Hernando Lopez, a teacher at Joseph Soyinka's son's school, is found brutally murdered in his locked classroom with the key in his hand, suspicion rests on Jermaine Letts, an adolescent gang member. With two other sets of keys in circulation, one a master set locked in the school safe and the other in the janitor's possession, how did the assailant get in and out of the school grounds? Joseph decides it's time to get involved and solve the puzzle of who killed Hernando and to find out why.