故事继续聚焦在上流社会的秘事，大侦探波洛（肯尼思·布拉纳 Kenneth Branagh 饰）在埃及度假期间， 卷入到了一场危险的三角关系之中，他在察觉到这趟旅程中不寻常的味道之后，登上了那条驶往阴谋和死亡的船。
The Duke of Frome John Langton with his wife, their baby born after complications during childbirth, a domineering nanny, nursery maid and valet arrive at Montague Hall for Lady Felicia’s Yuletide ball. During the evening the baby is taken from his cot. Inspector Mallory suspects an inside job by the valet when his secret wife arrives while Brown is more interested in the birth of the baby at a home for unmarried mothers. Mrs McCarthy under pressure from the diocese to provide a Christmas service fit for a Duke receives unexpected help from a vagrant she finds in the confessional.
Follows Mae Cannon as she finds herself restless inside a marriage that totally works. A new fantastical journey will take her to parallel universes.