Adventure of the Cheap Flat

Captain Hastings finds out from Gerald Parker about an unusually cheap flat rented to Mr and Mrs Robinson near Knightbridge. Mrs Robinson fears that the low price may be an indication that the house is haunted. Poirot is intrigued and sets out to investigate. A remarkable chain of circumstances led from the apparently trivial incidents which first attracted Poirot's attention to the sinister happenings which completed a most unusual case.