three consider contesting the will. Visiting the house on the pretence of buying it, Poirot discovers a nail covered with varnish at the top of the stairs, deducing a string had been tied to it. Through Miss Arundell's last words, he concludes that Bob had been out all night and that she had therefore fallen down the stairs as a result of a tripwire, and there is a chance Miss Arundell was indeed murdered. Her family thus become suspects in that matter. During his investigation, Poirot learns that a luminous aura was noticed coming from the dead woman's mouth when she spoke during a seance. Visiting Lawson at her home, he learns that she saw someone moving about on the night of Miss Arundell's fall, who wore a brooch with the initials "TA". At the same time, Lawson's gardener recalls Charles inquiring about his arsenic-based weed killer and is surprised to find the bottle containing it to be nearly empty. Bella later leaves her husband Jacob, on the implication he bullies her, taking the children with her. After Lawson helps hide them in a hotel, Poirot moves her to another on fear of a second murder; before he does, he gives her a summary of Miss Arundell's death. The next day, Bella is found dead from an overdose of sleeping medication. Poirot soon brings together the surviving family members and reveals that Bella was the murderer. She hated her husband, never truly loving him, and sought to separate from him and keep her children in England. As she had no means to do so, she decided to kill her aunt to inherit her portion of her wealth. When her first attempt with the tripwire failed, she decided to switch one of her aunt's capsules for her liver troubles, with one filled with elemental phosphorus, knowing that her death from the poison would mimic the symptoms of liver failure. The aura witnessed by those attending the seance was due to the poison Miss Arundell had unknowingly consumed. When she found out her aunt changed her will and that Poirot had discovered the cause of her death, Bella found herself in a far worse quandary. She relinquished her children back to their father before committing suicide; the medication was originally intended to be used to murder Jacob, who was to be her second victim. Poirot reveals that Lawson saw Bella on the