The Body in the Silo — Ronald A. Knox

When private investigator Miles Bredon and his wife, Angela, arrive for a weekend at the Hallifords' country house, they find themselves part of a singularly ill-assorted house party. Waking one morning to the news that one among their number has been found dead by the silo, Miles has no shortage of suspects.

The entire party had spent the previous night haring around the country side in an 'eloping' game instigated by their hostess, and no one can fully account for their whereabouts. The arrival of Inspector Leyland from Scotland Yard, investigating a spate of apparent suicides of important people, adds another dimension to the mystery, and Miles finds himself wondering 'whether the improbable ought to be told'.