During the investigation Curran becomes involved in a torrid and intense relationship with the prime suspect, Catherine Tramell Stone , an enigmatic writer. Even before its release, Basic Instinct generated heated controversy due to its overt sexuality and graphic depiction of violence. It was strongly opposed by gay rights activists, who criticized the film's depiction of homosexual relationships and the portrayal of a bisexual woman as a murderous, narcissistic psychopath. In San Francisco , homicide detective Nick Curran investigates the murder of retired rock star Johnny Boz, who has been stabbed with an ice pick during sex by a mysterious blonde woman. Nick's only suspect is Boz's bisexual girlfriend, crime novelist Catherine Tramell, who has written a novel that mirrors the crime.