The Keeper of Underwood Asylum has the mental patients of the wealthiest families in British Columbia. The rest of the family members have been dying under mysterious circumstances, so Biggs hires private investigator Richard Driver, who puts his assistant, Maybelline, in the asylum pretending she is his cousin and that they came from a family where the parents were all first cousins to each other...

The Keeper of Underwood Asylum has the mental patients of the wealthiest families in British Columbia. The rest of the family members have been dying under mysterious circumstances, so Biggs hires private investigator Richard Driver, who puts his assistant, Maybelline, in the asylum pretending she is his cousin and that they came from a family where the parents were all first cousins to each other...