Ursula Pell was both wealthy and eccentric, being perhaps too fond of playing elaborate jokes on her long suffering niece and nephew. Therefore, when she was found brutally murdered in her locked study, the motive was only too obvious, the hoard of gems worth millions left to her by her late husband and which the widow Pell had hidden in a secret location. With the inheritance of the niece seemingly another one of her cruel jokes, and all the clues to her murder pointing to the nephew, Ursula Pell might well have the last laugh, unless Fleming Stone, the famous detective, can prove the innocence of the nephew and the true value of ... The Diamond Pin