Philadelphia Blowup — Mike Barry

When a wolf leaves the pack, he lives only as long as he can kill by himself quicker and surer than any pack he runs up against. Meet a man beyond either forgiveness or vengeance. Meet the Man they Call The Lone Wolf. Better meet him now. The way he lives, he can't live much longer.

The warpath of Burt Wulff had begun in New York City, taken him cross-country to San Francisco, then in an ever-increasing ring of fire and brutal vengeance to Cuba, Peru and back to the USA for a killing run across the entire nation. But now Wulff's string was finally running out. Both the syndicate and the official police were gunning The Lone Wolf -- and now it was just a matter of time . . .