The fabulous -- and sometimes near the foolish -- terrorization of Elizabeth Withering when she is tracked down by Madame Serenzi and her two sons and lured to their Florida key for information about her father. A medieval arena, big cats, and the plotting for refugee fortunes, a long play on the ""lady or the tiger"" theme, and a piecing together from Florida to Havana, the F.B.I. and a gallant suitor -- all are combined in fashion plate sleekness for a slight tale of murder.