Sins of the Fathers by Chris Lynch

Solid Drew, unpreditable Skitz, and strong, silent Hector have been inseparable since they were six-years-old. The boys attend a Catholic school run by Monsignor Blarney, Father Shenanigan, and Father Mullarkey who threaten to break apart the group and send them in different directions. This vivid and fast-paced novel is hard-hitting.