Hercule Poirot's Christmas (S06E01)

In "Hercule Poirot's Christmas," the festive season takes a dark turn when Simeon Lee, convinced that someone is out to kill him, calls upon Poirot for assistance. Tragically, Simeon is murdered shortly after, and his precious diamonds vanish without a trace. Poirot must navigate a web of family secrets and deceit to uncover the truth behind the crime and bring the culprit to justice amidst the holiday chaos.