Miss Marple, a sharp-witted amateur detective residing in the quaint English village of St. Mary Mead, finds excitement as American actress Marina Gregg and her husband, producer Jason Rudd, move into the grand Gossington Hall to shoot a film. The village is buzzing with gossip and admiration for the Hollywood stars. During a fund-raiser held at Gossington Hall, a local woman named Heather Babcock gushes about meeting Marina. Shortly after, Heather collapses and dies from what appears to be poisoning. The incident raises more questions when it's revealed that Marina Gregg might have been the actual target.

The charming but no-nonsense Chief Inspector Craddock leads the official investigation, though Miss Marple, despite being sidelined due to an injury, continues to piece together clues. Every person around the glamorous Marina seems to harbor secrets and potential motives, intensifying the mystery. As Miss Marple conducts subtle but pointed interrogations—often from the comfort of her home—layer upon layer of deception and jealousy come to light, painting a vivid and complex portrait of life behind the scenes in Hollywood. The story builds toward nail-biting suspense, leaving whodunit fans on the edge of their seats as Miss Marple meticulously uncovers the truth.