The latter agrees but finds a rival sleuth in Evadne Mount, one of the house guests and a celebrated author of whodunits in her own right. When the Chief Inspector and Mount start their preliminary investigation of the crime, it soon turns out that each of the guests has a skeleton in the cupboard.
A mutual agreement is reached, but then a rival detective appears in Evadne Mount, another guest at the house who is also an accomplished writer of mystery novels. As the Chief Inspector and Mount start their initial investigation into the crime, they uncover that each guest has a hidden past or secret.