Who is murdering the young students that attend Saint Josephine Margaret Bakhita Preparatory School?

As the bodies mysteriously build up shock and scandal erupt on the grounds of a private parochial school affiliated with the neighboring church and convent that serve and inspire the community.

Is the killer the obvious suspect or the one that everyone least expects committing these awful, brutal crimes?

Will the true killer escape capture? Or will the innocent person pay the penalty for the sins of another? Or could it just be the one suspected at the start the true murderer there right under everybody's nose?