Bone — George C. Chesbro

While the Human Resources Administration tries to aid the homeless, a psychopath beheads hopeless derelicts on the streets of New York. A man called Bone, himself a street person, becomes the prime suspect: the period of his amnesia coincides with the serial killings. While trying to regain his memory, prove his innocence, and protect the social worker he loves, Bone prowls the city's underground.