She eventually kills Whitney when Vance requests she retrieve the will , which would result in the discovery of her chicanery .
He discovers that this will was rewritten by Vance 's assistant , Ida Forsythe , to include herself in the will .
assistant eventually kills Whitney when Vance requests she retrieve the will , which would result in the discovery of her chicanery .
He discovers that this will was rewritten by Vance 's assistant , Ida Forsythe , to include herself in the will .