Beautiful twenty- time-old Linnet Ridgeway is one of the flush women in England, the inheritor to a vast fortune. She’s in the final stages of revamping her recently- acquired estate, Wode Hall, when her stylish friend, the poor but clever Jacqueline “ Jackie” de Bellefort asks a favor could Linnet hire Jackie’s fiancé, Simon Doyle, who’s poor and lately out of a job? Linnet agrees to meet Simon and is incontinently drawn to him. Soon the handsome, fascinating Simon isn’t only her land agent but also her hubby.
Linnet and Simon depart for their honeymoon. Linnet is supposedly one of the luckiest women on earth she’s youthful, healthy, fabulously fat, enchantingly beautiful, breathtakingly glamorous, recently in love, and blissfully happy. But what seems like the morning of a entranced life is actually the morning of the end. First, Jackie enacts a form of cerebral vengeance that leaves Linnet hopeless and shaken everyplace Linnet and Simon go on their honeymoon, they find Jackie there, too.
Pressures heighten as Simon and Linnet embark on a Nile voyage. Their fellow passengers bring their own share of mystifications and conspiracy on board the Karnak with them there’s the quiet Mr. Fanthorp, whose claims to be on vacation are uncompelling; the radical Mr. Ferguson, consumed by resentment toward the upper classes; Linnet’s uncle, Andrew Pennington, who claims to have encountered her abroad by bare coexistence (but whose luggage markers suggest another story);Mrs. Otterbourne, a novelist in decline, harboring an unnamed illness; and her son Rosalie, who seems to suffer some inner torture.
There’s also the affable Mrs. Allerton, whose son, Tim, is inexplicably cautious of questions about his relationship with his kinsman, Joanna; the cunning and mysterious maid, Louise, recently in Linnet’s service; Richetti, the archaeologist hopeless to keep the contents of his telegrams private; and the elitist old Miss Van Schuyler, whose constant demands terrify her sweet bastard, Cornelia, who seems to have commodity to hide. Luckily, the famed operative, Hercule Poirot, is also on board.
Linnet expresses growing apprehension, claiming to feel the abomination of all those around her. One day, on a sightseeing trip ashore, a boulder comes casting toward Linnet. This is the first attempt on her life (or is it just an accident?).
One night, after a particularly stifling day, pressures come to a head. Jackie has too important to drink in the taproom and seems fraudulent on provoking Simon, and telling the world how he has wronged her. She loses her temper, draws her dynamo, and shoots. In the flurry of exertion that follows, Simon, who has not been mortally wounded, gets care, while a morbidly-apologetic Jackie, putatively fraudulent on self-murder, has her dynamo goes missing.
The coming morning, Poirot and his friend, Colonel Race, awaken to a alternate jolt of grim news during the night, Linnet was shot dead, the killer’s modus operandi identical in every respect to the murderous fantasy Jackie formerly confessed to Poirot. Jackie is the only person on the Karnak with a plum- handled dynamo, ample motive, and a professed intent to kill Linnet, but there’s just one catch Jackie, who was cured and under the close watch of a nanny all night, couldn’t have done it.
Poirot begins a hunt for the killer but before chancing him or her, he uncovers the other passengers lies and secrets Rosalie Otterbourne’s reason for throwing a parcel overboard on the night of the murder; what came of Linnet’s expensive plums; Tim and Joanna’s secret; the dark verity about Mrs. Otterbourne’s illness; and the true provocation for Fanthorp’s trip abroad, not to mention the identity of a dangerous kindler and known killer who turns out to be on board.
As Poirot gets near to the verity, two further passengers lose their lives Louise Bourget, Linnet’s maid, who appears to have tried to blackmail the killer; and Mrs. Otterbourne, whose secret dealings with the boat’s crew put her in the wrong place at the wrong time. With Race’s help, Poirot unravels the interlocking mystifications and brings the killers to an amiss but humane justice.