`I`m taking a revolver to Thrackley. You never know with blokes like Carson. I hate these harmless, potty people
- they`re always up to something.` Jim Henderson is one of six guests summoned by the mysterious Edwin Carson, a collector of precious stones, to a weekend party at his country house, Thrackley. The house is gloomy & forbidding but the party is warm & hospitable
- except for the presence of Jacobson, the sinister butler. The other guests are wealthy people draped in jewels; Jim cannot imagine why he belongs in such company. After a weekend of adventure
- with attempted robbery & a vanishing guest
- secrets come to light & Jim unravels a mystery from his past.