Delaney has discovered that a similar attack had occurred recently on West 79th Street. After consulting with the perpetually harried Ferguson, he discovers that the wound patterns are nearly identical. As they investigate, they realize that similar attacks have been taking place all over New York City. Langley uses the new information to locate the exact model of ice axe that would cause such injuries. At one sporting goods store, the owner hands over the addresses that he collected from every customer who bought that ice axe. The addresses eventually lead Delaney to the high-rise building of Daniel Blank (Dukes).