Gridley Nelson of homicide is still on active duty. This time he's called to a posh - plump out, slim home - reducing and physical fitness salon- of which even the present Administration would disapprove. The crimes are vehicular homicide and nutmeg poisoning. The people involved - a quondam stripper, a libidinous receptionist, a cad in a sweatshirt, and a grudge-bearing brother. Once again, Miss Fenisong has wrought competently.