On the eve of his 75th birthday, billionaire Charles Abernathy extends an invitation to his four estranged children to return home. He harbors apprehension that an individual or entity may be intent on causing his demise this evening. To secure the assistance of his family in safeguarding him from the impending threat, Abernathy places each of their inheritances at risk. Should he be discovered deceased by dawn, they will be deprived of any inheritance.