Build a movie plot around this: Who does Nick have an affair with? He has a sexual relationship with both Beth and Catherine.
The answer to this question is:
Down-and-out detective SFPD Nick Curran is called to investigate the murder of a wealthy former rock star, Johnny Boz, who was brutally stabbed to death with an ice pick while having sex with a blonde woman. Boz had ties to the mayor and a mayor's aide hovers over them during their investigation. After the crime scene investigation, he sees Beth Garner, an SFPD psychiatrist that Internal Affairs has required him to see. She asks him about his drug and alcohol use and he says he's been clean and sober for three months.The only lead the police have on Boz' murder is Catherine Tramell, a successful and extremely wealthy crime novelist who was the last person seen with Boz the night he died. Curran and fellow detective Gus Moran (George) look for Tramell at her Pacific Heights mansion, but they find only Roxy, Tramell's lesbian lover, is home. Roxy tells them Tramell is at her Stinson Beach beach house, and mentions that "she didn't do it, kill Johnny Boz". Curran and Moran go to the beach house to question Tramell and find her on a deckchair by the ocean. The two policemen introduce themselves, and Tramell says to Curran "I know who you are". They ask her questions about her relationship with Boz. She insists they weren't dating ("I wasn't dating him, I was fucking him"). Upon hearing that he is dead, she shows very little remorse, saying that she most misses their sexual encounters.Both Morran and Gus discover that Tramell has written a novel about a former rock star who was killed in the exact same way - tied to the bed with a white scarf and stabbed multiple times with an ice-pick. They strongly suspect she murdered Boz. After another confrontation with the detectives, Tramell agrees to go to police headquarters to be interviewed about the murder. She asks to change into something "more appropriate" and returns wearing a short white miniskirt. During the interview she uncrosses and crosses her legs in a provocative manner, briefly exposing her genitalia, and the interrogators--especially Curran--are...