GIDEON'S RIVER

There are usually at least three cases up for simultaneous solution under that master coordinator of police detection, Commander of the Criminal Investigation Department of the Metropolitan Police--Scotland Yard's George Gideon. Gee-Gee's fans are legion and this time they have a kidnapping, industrial diamond smuggling, and an upper-echelon detective going murderously mad, all within the precincts of London's Thames Division. Jolly good.