Following an otherwise-enjoyable literary luncheon, the celebrated crime novelist Ariadne Oliver is accosted by a particularly formidable woman who engages her in conversation about among her many god-daughters, whom Ariadne hasn’t noticed since she was a child. She lands a bombshell with the query ‘What I want to know is this: do her mother kill her dad, or was it the daddy who killed the mother?’ Affronted and bewildered with the assertiveness of the pushy busybody, Ariadne is usually however intrigued. There’s only one thing for this. She must contact her aged friend Hercule Poirot. Collectively they set about unravelling the secret of a tragedy through the faraway past – provoked in equal measure by hate and love. As constantly, John Moffatt superstars as Hercule Poirot, while Julia McKenzie stars as Ariadne Oliver – whom Agatha Christie predicated on herself.