From the back cover: "Lightning strikes the 87th Precinct with devasting fury, illuminating the grisly handiwork of a madman: the bodies of slain coeds hanging from lamp posts throughout the city. Lightning electrifies a frightened community as a fiendish serial rapist returns to terrorize the same victims over and over. Now the valiant cops of the 87th must put their lives on the line and brave the savage storm of violence and death surrounding them. For if left unchecked, this particularly lethal lightning threatens to strike, not twice, but again and again....."
Another good read from Ed McBain on his 87th Precinct series.