An English country house is thrown into chaos when an inventor's new chemical formula is stolen. He asks for it back and is murdered when the lights go out. Arriving just moments too late, one man senses a potent brew of despair, treachery and deception among the house's occupants.
That man is Hercule Poirot. Can Poirot discover the truth? As usual, Agatha Christie dangles a fishing-rod of confusing red herrings in a murky sea before Poirot can discover the truth. Can you beat Hercule Poirot in discovering the murderer to celebrate Agatha Christie's 125th Anniversary?