Sir Manuel Camargue, yesterday one of the most celebrated musicians of his time, today floats face down in the lake near his sprawling English country house. The consensus is accidental death -- but Inspector Wexford knows the stench of murder most foul when he smells it. Particularly in the company of two suspects -- one, the victim"s fiancee, who is too young to be true, the other his daughter who may be no kin and even less kind . . .