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Whilst waiting for his dinner at Pleasant's Coffee House, Hercule Poirot meets a young woman named Jennie. She confides in Poirot that she will soon be murdered, and that nothing can be done to stop it; after refusing Poirot's assistance, Jennie departs in distress, and Poirot is unable to find out anymore information from the staff about Jennie or her address. After returning to the guest house where he is staying, Poirot describes the events to Edward Catchpool, an officer at Scotland Yard - Catchpool reveals that he has spent the day investigating three murders at the luxurious Bloxham Hotel; two women and a man, all in separate rooms, were found dead earlier in the evening, each with a monogrammed cufflink (with the letters 'PJI') in their mouths.

The following day, Poirot and Catchpool attend the scene of the crime where they discover more details about the victims with the hotel's owner, Luca Lazzari; the victims (Harriet Sippel, Ida Gransbury and Richard Negus) had all arrived at the hotel separately on the same day; each victim was found in their locked hotel rooms; the murders occurred between 19:15 and 20:10 (all three victims were seen alive at 19:15 by hotel staff); Mr. Negus had booked the rooms for all three victims and paid for them ahead of time; a junior clerk saw Mr. Negus in the reception area 15 minutes after room service was provided for the victims. Later on, it's revealed that all three victims had lived in a village called Great Holling, and that Mr. Negus had been engaged to Ida - in addition, Richard had left Great Holling in 1913 after the deaths of the village vicar and his wife, Patrick and Frances Ives. Poirot sends Catchpool to Great Holling to discover more information about the victims. After arriving in the village, Catchpool meets Margaret Ernst, widow of the most recent vicar for the village. After some reluctance, Margaret relays to Catchpool the events of 1913. The vicar's maid had told Harriet Sippel a rumour that the vicar was taking money from villagers to help them 'communicate' with deceased loved ones. Harriet spread the rumour around the village, with the support of Ida and Mr. Negus. The rumours spiralled until there were calls to remove Ives as Vicar, and Frances' health declined as a result. Eventually, unable to bear the rumours any longer, Frances took her own life, with the heartbroken vicar following shortly afterwards. After some questioning, Catchpool learns that the maid who told the original lie was Jennie Hobbs - the same Jennie that Poirot has been searching for all this time.

Meanwhile, as Catchpool is leaving London, Poirot arranges to meet with Nancy Ducane, a famous artist who was seen to be leaving the hotel shortly after the murders - Nancy was also mentioned in Margaret's story as the villager seen to be visiting the church at night with Ives. During the visit, Nancy recognises the names of various Great Holling residents but refuses to provide anymore details. However, Poirot and Constable Stanley Beer find a pair of keys that correspond to two of the victims' hotel rooms. Whilst visiting the home of Nancy's friend to confirm her alibi, Poirot notes several details from different paintings within the house. Shortly after returning home, Poirot learns from Scotland Yard that a fourth murder has occurred at the Bloxham - with Catchpool, the two gentlemen return to the hotel - they find a pool of blood, a monogrammed cufflink and (to Poirot's dismay) Jennie's hat within the room. After returning to their guest house, Poirot and Catchpool are visited by Nancy, who confesses her connection to the events in Great Holling; she was having an affair with Ives, and Jennie - who was also in love with the vicar - had spread the rumours out of jealousy. Nancy's attempts to placate the villagers by telling the truth were dismissed, and indeed further ruined the reputation of the vicar. The following day, Poirot takes Catchpool to visit the address of Samuel Kidd, the witness who saw Nancy at the hotel. However, instead of Samuel, they are greeted by Jennie Hobbs who - Poirot reveals - was formerly engaged to Samuel before she met the vicar. After listening to her testimony, Poirot and Catchpool return to Great Holling in response to a serious attack on Margaret - after speaking with the village doctor, Ambrose Flowerday, Poirot decides to return to the Bloxham one last time to resolve the case.

At the hotel, Poirot gathers the hotel staff and suspects together to reveal the solution; Nancy Ducane and Jennie Hobbs (with Kidd's assistance) had conspired to kill the three victims. Nancy & Kidd had impersonated Harriet & Mr. Negus at 19.15, and Kidd was the gentleman seen by the clerk at the front desk at 19.30. Nancy confesses to the crimes, but is fatally stabbed by Jennie. At Scotland Yard, Jennie, confesses her side of the story; In 1913, the rumour that Jennie had created was actually intended to save Ives from the scandal of his affair with Nancy. Harriet was convinced that the vicar could help her speak to her dead husband, and upon being refused, viciously spread the rumour in Great Holling. Years later, Mr. Negus contacted Jennie out of remorse for his actions, and the two people hatched a plan to kill all four guilty parties involved in the rumour. Mr. Negus and Jennie would lure Harriet and Ida to the Bloxham under false pretenses and poison them separately; Mr. Negus would then poison Jennie, and finally himself. However, Jennie secretly revealed the plan to Nancy to avoid her own death, and convinced Richard to die before her so that she could find justice against Nancy. Mr. Negus agreed to this plan, and Jennie arranged the scene to look like Mr. Negus had killed himself. Jennie had killed Nancy after she revealed at the meeting that her relationship with Ives had been a physical one, rather than the chaste romance that Jennie had been led to believe.

Four days after Jennie and Kidd's arrest, Poirot and Catchpool receive a letter from Dr Flowerday and Margaret Ernst; they have harboured feelings for each other for years, and after Poirot's intervention have decided to marry.
Give me a numbered list of the named characters in the following passage.
1. Hercule Poirot
2. Jennie Hobbs
3. Edward Catchpool,
4. Luca Lazzari
5. Harriet Sippel
6. Ida Gransbury
7. Richard Negus
8. Patrick Ives
9. Frances Ives
10. Margaret Ernst
11. Nancy Ducane
12. Constable Stanley Beer
13. Samuel Kidd
14. Ambrose Flowerday