In a secluded country house, a government scientist’s top-secret formula vanishes just before he is found dead, leaving the room in darkness and the household under suspicion. Hercule Poirot is called in to investigate, navigating a web of relatives, romantic entanglements, and potential spies as he works to uncover both the killer and the fate of the missing weapon.

The play is written by Agatha Christie (author of Murder on the Orient Express and The Mousetrap), marking her first work to feature the character of Hercule Poirot on stage.

Set within the conventions of a classic drawing-room mystery, the production centers on intricate plotting, concealed motives, and the gradual revelation of clues among an ensemble of suspects.