<p>The theft of the diamond necklace and the antique pistols might all be explained, but the body in the lake is particularly puzzling. 'Don't expect me to solve anything,' Inspector Wilkins announces modestly when he arrives to sort out the unpleasantness. And at a gathering that includes English aristocracy, foreign agents in disguise, a ravishing baroness, a daring jewel thief, a Texan millionaire and, of course, the redoubtable...