I park my car in the lot in front of the rectory of Sacred Heart in Camden, N.J., and walk through a gray drizzle to Emerald Street. My friend Lolly Davis, whose blood pressure recently shot up and whose kidneys shut down, had been taken to a hospital in an ambulance but was now home. I climb the concrete steps to her row house and ring the bell. There is an overpowering stench of garbage in the street. Her house is set amid other brick and wooden residences, some of which have been refurbished under Monsignor Michael Doyle’s Heart of Camden project at Sacred Heart, a Roman Catholic parish. Other structures on Davis’ street sit derelict or bear the scars of decay and long abandonment.

Lolly’s grandson, nicknamed Boom Boom or Boomer, answers the door. He tells me his grandmother is upstairs. I enter and sit on a beige chair in the living room near closed white blinds that cover the window looking out on Emerald Street. The living room has a large flat screen television and two beige couches with brown and burnt-red floral patterns that match the chair. There is a stone fireplace with a mantel crowded with family photos. Her grandson, one of numerous children from the neighborhood whom she adopted and raised, yells upstairs to let Lolly know I have arrived.

Lolly, 69, appears at the top of the ...