The Mirror Crack'd from Side to Side

One minute, silly Heather Badcock had been gabbing on to her movie idol, the glamorous Marina Gregg. The next, Heather suffered a massive seizure. It turned out to be a deadly poison. But for whom was it really intended?
Marina’s frozen expression suggested she had witnessed something horrific. While others searched for material evidence, Jane Marple conducted a very different investigation – into human nature.
Librarian's note: this entry is for the novel, "The Mirror Crack'd from Side to Side." Collections and other Miss Marple stories are located elsewhere on Goodreads. The series includes 12 novels and 20 short stories. Entries for the short stories can be found by searching Goodreads for: "a Miss Marple Short Story."