Who had a hand in the murder of a country gent?

All manner of friction fills the English country house shared by genteel retiree Percival Pyke Period and fuddy-duddy lawyer Harry Cartell. Until one of them, after a flamboyant dowager's treasure hunt party, is found murdered-face down in the mire of an open drain. Which of Superintendent Roderick Alleyn's suspects-linked by a tangled set of relationships-wore a crucial, missing pair of gloves to commit this dirty deed?