Le tableau maudit du Dr Lenoir

During an evening with friends, Doctor Lenoir mentions a family portrait that would cause the death of all those who sleep under it. Mr. Olive then challenges him to spend the night under this cursed painting. The next day, the doctor is found unconscious in his bed... Has the curse struck again? You don't believe it. For you, one thing is certain: the culprit is among you and you intend to unmask him!