A killing of angels

"The first death looked like a suicide. Except, someone had tucked a picture of an angel and a handful of white feathers into the banker's pocket before pushing him in front of a train. When a second victim is found, it's apparent that a killer is stalking The Square Mile, the financial district in London: an avenging angel intent on punishment. But why these victims? What were their sins?"--Dust jacket flap.