T.Y. Drake

A college fraternaty prank goes bad and student ends up in the mental ward. Four years later, it's graduation time, and the members of the fraternity decide to have a costume party aboard a train trip to celebrate thier graduation. Unknowingly to them, a killer has slipped aboard, wacking them off one by one, disguised in the costumes of the victims. (imdb)

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 and they decided to keep their love platonic for genetic reasons... (imdb)