Murder In Three Acts by Agatha Christie

At an elegant cocktail party, a kindly clergyman dies suddenly, soon echoed by a similar poisoning at another gathering, and a third suspicious death deepens the mystery. A celebrated Belgian detective, observing alongside a sharp-eyed socialite and a charismatic actor, disentangles a plot staged like a play in three acts, where disguise, timing, and misdirection conceal a ruthless motive. Uncovering that the pattern is a deliberate smokescreen, he exposes the murderer and the true target behind the carefully orchestrated crimes.