What is the main conflict in Jack and Jill by James Patterson?

Jack and Jill by James Patterson is the third installment in Patterson's popular Alex Cross novels. In this novel, Cross finds himself torn between two serial murder cases. The first serial killer is active in Cross's own backyard, killing children who attend the Sojourner Truth School, the school Cross's own son attends. This case hits so close to home that Cross is passionately determined to solve it as quickly as possible.