The screenwriter Peter Straughan has become adept at taking well known — and beloved — books and adapting them for the big and small screens. Now he has been nominated for a second Oscar: for his screenplay for “Conclave,” based on Robert Harris’s political thriller set in the secret world of a papal election. He spoke with Gilbert Cruz, the host of “The Book Review” podcast, to discuss how a pivotal scene involving Sister Agnes, played by Isabella Rosellini, carries a potent message for the tone of the film. #peterstraughan #conclave #BookTok #oscars #academyawards