According to the original plot, Arabella Donovan's third grand-uncle died from a sudden asthma attack.
A disease like asthma is simple to control, but very difficult to cure completely.
Sudden asthma attacks are often linked to allergens. Since her third grand-uncle had suffered from asthma for many years, it was impossible for the family not to know about the potential allergens that could trigger a relapse.
And yet, the incident occurred in his own home, the safest place for him. At the time, no one else was home, and the medicine he carried with him was, for some unknown reason, finished and empty.
This delayed any chance for emergency treatment. With so many things happening at once, it couldn't possibly have been a coincidence.
