<p><p>rosemary Barton’s Birthday Party Takes A Turn For The Worse When She Imbibes Cyanide Instead Of Champagne. The Verdict? Suicide. But Why Would A Beautiful, Wealthy Woman Kill Herself, Especially When So Many Of Her Guests — Including Her Lover, Her Husband, And Her Own Younger Sister — Have Reasons To Want Her Dead? When Anonymous Letters Questioning The Coroner’s Verdict Start Turning Up A Year Later, Rosemary’s Husband Decides To Recreate The Party And Corner The Killer. Unfortunately, The Killer Has Other Ideas.</p>